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2015-02-13tile: use %*pb[l] to print bitmaps including cpumasks and nodemasksTejun Heo
printk and friends can now format bitmaps using '%*pb[l]'. cpumask and nodemask also provide cpumask_pr_args() and nodemask_pr_args() respectively which can be used to generate the two printf arguments necessary to format the specified cpu/nodemask. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-13Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tileLinus Torvalds
Pull arch/tile changes from Chris Metcalf: "Not much in this batch, just some minor cleanups" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: tile: change MAINTAINERS website from tilera.com to ezchip.com tile: enable sparse checks for get/put_user tile: fix put_user sparse errors tile: default to little endian on older toolchains
2015-02-12all arches, signal: move restart_block to struct task_structAndy Lutomirski
If an attacker can cause a controlled kernel stack overflow, overwriting the restart block is a very juicy exploit target. This is because the restart_block is held in the same memory allocation as the kernel stack. Moving the restart block to struct task_struct prevents this exploit by making the restart_block harder to locate. Note that there are other fields in thread_info that are also easy targets, at least on some architectures. It's also a decent simplification, since the restart code is more or less identical on all architectures. [james.hogan@imgtec.com: metag: align thread_info::supervisor_stack] Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: David Miller <davem@davemloft.net> Acked-by: Richard Weinberger <richard@nod.at> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Steven Miao <realmz6@gmail.com> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Tested-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.linux@gmail.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-11mm: make FIRST_USER_ADDRESS unsigned long on all archsKirill A. Shutemov
LKP has triggered a compiler warning after my recent patch "mm: account pmd page tables to the process": mm/mmap.c: In function 'exit_mmap': >> mm/mmap.c:2857:2: warning: right shift count >= width of type [enabled by default] The code: > 2857 WARN_ON(mm_nr_pmds(mm) > 2858 round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT); In this, on tile, we have FIRST_USER_ADDRESS defined as 0. round_up() has the same type -- int. PUD_SHIFT. I think the best way to fix it is to define FIRST_USER_ADDRESS as unsigned long. On every arch for consistency. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-11mm/hugetlb: reduce arch dependent code around follow_huge_*Naoya Horiguchi
Currently we have many duplicates in definitions around follow_huge_addr(), follow_huge_pmd(), and follow_huge_pud(), so this patch tries to remove the m. The basic idea is to put the default implementation for these functions in mm/hugetlb.c as weak symbols (regardless of CONFIG_ARCH_WANT_GENERAL_HUGETL B), and to implement arch-specific code only when the arch needs it. For follow_huge_addr(), only powerpc and ia64 have their own implementation, and in all other architectures this function just returns ERR_PTR(-EINVAL). So this patch sets returning ERR_PTR(-EINVAL) as default. As for follow_huge_(pmd|pud)(), if (pmd|pud)_huge() is implemented to always return 0 in your architecture (like in ia64 or sparc,) it's never called (the callsite is optimized away) no matter how implemented it is. So in such architectures, we don't need arch-specific implementation. In some architecture (like mips, s390 and tile,) their current arch-specific follow_huge_(pmd|pud)() are effectively identical with the common code, so this patch lets these architecture use the common code. One exception is metag, where pmd_huge() could return non-zero but it expects follow_huge_pmd() to always return NULL. This means that we need arch-specific implementation which returns NULL. This behavior looks strange to me (because non-zero pmd_huge() implies that the architecture supports PMD-based hugepage, so follow_huge_pmd() can/should return some relevant value,) but that's beyond this cleanup patch, so let's keep it. Justification of non-trivial changes: - in s390, follow_huge_pmd() checks !MACHINE_HAS_HPAGE at first, and this patch removes the check. This is OK because we can assume MACHINE_HAS_HPAGE is true when follow_huge_pmd() can be called (note that pmd_huge() has the same check and always returns 0 for !MACHINE_HAS_HPAGE.) - in s390 and mips, we use HPAGE_MASK instead of PMD_MASK as done in common code. This patch forces these archs use PMD_MASK, but it's OK because they are identical in both archs. In s390, both of HPAGE_SHIFT and PMD_SHIFT are 20. In mips, HPAGE_SHIFT is defined as (PAGE_SHIFT + PAGE_SHIFT - 3) and PMD_SHIFT is define as (PAGE_SHIFT + PAGE_SHIFT + PTE_ORDER - 3), but PTE_ORDER is always 0, so these are identical. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: David Rientjes <rientjes@google.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Steve Capper <steve.capper@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-10Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge misc updates from Andrew Morton: "Bite-sized chunks this time, to avoid the MTA ratelimiting woes. - fs/notify updates - ocfs2 - some of MM" That laconic "some MM" is mainly the removal of remap_file_pages(), which is a big simplification of the VM, and which gets rid of a *lot* of random cruft and special cases because we no longer support the non-linear mappings that it used. From a user interface perspective, nothing has changed, because the remap_file_pages() syscall still exists, it's just done by emulating the old behavior by creating a lot of individual small mappings instead of one non-linear one. The emulation is slower than the old "native" non-linear mappings, but nobody really uses or cares about remap_file_pages(), and simplifying the VM is a big advantage. * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (78 commits) memcg: zap memcg_slab_caches and memcg_slab_mutex memcg: zap memcg_name argument of memcg_create_kmem_cache memcg: zap __memcg_{charge,uncharge}_slab mm/page_alloc.c: place zone_id check before VM_BUG_ON_PAGE check mm: hugetlb: fix type of hugetlb_treat_as_movable variable mm, hugetlb: remove unnecessary lower bound on sysctl handlers"? mm: memory: merge shared-writable dirtying branches in do_wp_page() mm: memory: remove ->vm_file check on shared writable vmas xtensa: drop _PAGE_FILE and pte_file()-related helpers x86: drop _PAGE_FILE and pte_file()-related helpers unicore32: drop pte_file()-related helpers um: drop _PAGE_FILE and pte_file()-related helpers tile: drop pte_file()-related helpers sparc: drop pte_file()-related helpers sh: drop _PAGE_FILE and pte_file()-related helpers score: drop _PAGE_FILE and pte_file()-related helpers s390: drop pte_file()-related helpers parisc: drop _PAGE_FILE and pte_file()-related helpers openrisc: drop _PAGE_FILE and pte_file()-related helpers nios2: drop _PAGE_FILE and pte_file()-related helpers ...
2015-02-10Merge tag 'pci-v3.20-changes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI changes from Bjorn Helgaas: "Enumeration - Move domain assignment from arm64 to generic code (Lorenzo Pieralisi) - ARM: Remove artificial dependency on pci_sys_data domain (Lorenzo Pieralisi) - ARM: Move to generic PCI domains (Lorenzo Pieralisi) - Generate uppercase hex for modalias var in uevent (Ricardo Ribalda Delgado) - Add and use generic config accessors on ARM, PowerPC (Rob Herring) Resource management - Free resources on failure in of_pci_get_host_bridge_resources() (Lorenzo Pieralisi) - Fix infinite loop with ROM image of size 0 (Michel Dänzer) PCI device hotplug - Handle surprise add even if surprise removal isn't supported (Bjorn Helgaas) Virtualization - Mark AMD/ATI VGA devices that don't reset on D3hot->D0 transition (Alex Williamson) - Add DMA alias quirk for Adaptec 3405 (Alex Williamson) - Add Wellsburg (X99) to Intel PCH root port ACS quirk (Alex Williamson) - Add ACS quirk for Emulex NICs (Vasundhara Volam) MSI - Fail MSI-X mappings if there's no space assigned to MSI-X BAR (Yijing Wang) Freescale Layerscape host bridge driver - Fix platform_no_drv_owner.cocci warnings (Julia Lawall) NVIDIA Tegra host bridge driver - Remove unnecessary tegra_pcie_fixup_bridge() (Lucas Stach) Renesas R-Car host bridge driver - Fix error handling of irq_of_parse_and_map() (Dmitry Torokhov) TI Keystone host bridge driver - Fix error handling of irq_of_parse_and_map() (Dmitry Torokhov) - Fix misspelling of current function in debug output (Julia Lawall) Xilinx AXI host bridge driver - Fix harmless format string warning (Arnd Bergmann) Miscellaneous - Use standard parsing functions for ASPM sysfs setters (Chris J Arges) - Add pci_device_to_OF_node() stub for !CONFIG_OF (Kevin Hao) - Delete unnecessary NULL pointer checks (Markus Elfring) - Add and use defines for PCIe Max_Read_Request_Size (Rafał Miłecki) - Include clk.h instead of clk-private.h (Stephen Boyd)" * tag 'pci-v3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (48 commits) PCI: Add pci_device_to_OF_node() stub for !CONFIG_OF PCI: xilinx: Convert to use generic config accessors PCI: xgene: Convert to use generic config accessors PCI: tegra: Convert to use generic config accessors PCI: rcar: Convert to use generic config accessors PCI: generic: Convert to use generic config accessors powerpc/powermac: Convert PCI to use generic config accessors powerpc/fsl_pci: Convert PCI to use generic config accessors ARM: ks8695: Convert PCI to use generic config accessors ARM: sa1100: Convert PCI to use generic config accessors ARM: integrator: Convert PCI to use generic config accessors PCI: versatile: Add DT-based ARM Versatile PB PCIe host driver ARM: dts: versatile: add PCI controller binding of/pci: Free resources on failure in of_pci_get_host_bridge_resources() PCI: versatile: Add DT docs for ARM Versatile PB PCIe driver PCI: Fail MSI-X mappings if there's no space assigned to MSI-X BAR r8169: use PCI define for Max_Read_Request_Size [SCSI] esas2r: use PCI define for Max_Read_Request_Size tile: use PCI define for Max_Read_Request_Size rapidio/tsi721: use PCI define for Max_Read_Request_Size ...
2015-02-10tile: drop pte_file()-related helpersKirill A. Shutemov
We've replaced remap_file_pages(2) implementation with emulation. Nobody creates non-linear mapping anymore. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-09Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull RCU updates from Ingo Molnar: "The main RCU changes in this cycle are: - Documentation updates. - Miscellaneous fixes. - Preemptible-RCU fixes, including fixing an old bug in the interaction of RCU priority boosting and CPU hotplug. - SRCU updates. - RCU CPU stall-warning updates. - RCU torture-test updates" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (54 commits) rcu: Initialize tiny RCU stall-warning timeouts at boot rcu: Fix RCU CPU stall detection in tiny implementation rcu: Add GP-kthread-starvation checks to CPU stall warnings rcu: Make cond_resched_rcu_qs() apply to normal RCU flavors rcu: Optionally run grace-period kthreads at real-time priority ksoftirqd: Use new cond_resched_rcu_qs() function ksoftirqd: Enable IRQs and call cond_resched() before poking RCU rcutorture: Add more diagnostics in rcu_barrier() test failure case torture: Flag console.log file to prevent holdovers from earlier runs torture: Add "-enable-kvm -soundhw pcspk" to qemu command line rcutorture: Handle different mpstat versions rcutorture: Check from beginning to end of grace period rcu: Remove redundant rcu_batches_completed() declaration rcutorture: Drop rcu_torture_completed() and friends rcu: Provide rcu_batches_completed_sched() for TINY_RCU rcutorture: Use unsigned for Reader Batch computations rcutorture: Make build-output parsing correctly flag RCU's warnings rcu: Make _batches_completed() functions return unsigned long rcutorture: Issue warnings on close calls due to Reader Batch blows documentation: Fix smp typo in memory-barriers.txt ...
2015-01-29vm: add VM_FAULT_SIGSEGV handling supportLinus Torvalds
The core VM already knows about VM_FAULT_SIGBUS, but cannot return a "you should SIGSEGV" error, because the SIGSEGV case was generally handled by the caller - usually the architecture fault handler. That results in lots of duplication - all the architecture fault handlers end up doing very similar "look up vma, check permissions, do retries etc" - but it generally works. However, there are cases where the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV. In particular, when accessing the stack guard page, libsigsegv expects a SIGSEGV. And it usually got one, because the stack growth is handled by that duplicated architecture fault handler. However, when the generic VM layer started propagating the error return from the stack expansion in commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page"), that now exposed the existing VM_FAULT_SIGBUS result to user space. And user space really expected SIGSEGV, not SIGBUS. To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those duplicate architecture fault handlers about it. They all already have the code to handle SIGSEGV, so it's about just tying that new return value to the existing code, but it's all a bit annoying. This is the mindless minimal patch to do this. A more extensive patch would be to try to gather up the mostly shared fault handling logic into one generic helper routine, and long-term we really should do that cleanup. Just from this patch, you can generally see that most architectures just copied (directly or indirectly) the old x86 way of doing things, but in the meantime that original x86 model has been improved to hold the VM semaphore for shorter times etc and to handle VM_FAULT_RETRY and other "newer" things, so it would be a good idea to bring all those improvements to the generic case and teach other architectures about them too. Reported-and-tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Jan Engelhardt <jengelh@inai.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-01-27tile: use PCI define for Max_Read_Request_SizeRafał Miłecki
Replace a magic number with a PCI #define symbol. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-01-20module: remove mod arg from module_free, rename module_memfree().Rusty Russell
Nothing needs the module pointer any more, and the next patch will call it from RCU, where the module itself might no longer exist. Removing the arg is the safest approach. This just codifies the use of the module_alloc/module_free pattern which ftrace and bpf use. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Alexei Starovoitov <ast@kernel.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Ley Foon Tan <lftan@altera.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: x86@kernel.org Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: linux-cris-kernel@axis.com Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: nios2-dev@lists.rocketboards.org Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: netdev@vger.kernel.org
2015-01-20module_arch_freeing_init(): new hook for archs before module->module_init freed.Rusty Russell
Archs have been abusing module_free() to clean up their arch-specific allocations. Since module_free() is also (ab)used by BPF and trace code, let's keep it to simple allocations, and provide a hook called before that. This means that avr32, ia64, parisc and s390 no longer need to implement their own module_free() at all. avr32 doesn't need module_finalize() either. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-kernel@vger.kernel.org Cc: linux-ia64@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linux-s390@vger.kernel.org
2015-01-13tile: enable sparse checks for get/put_userChris Metcalf
Add an extra intermediate variable to __get_user and __put_user to give sparse an opportunity to detect mismatches. Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-01-13tile: fix put_user sparse errorsChris Metcalf
Use x86's __inttype macro instead of using the typeof(x-x) trick to generate a suitable integer size type. This avoids a sparse warning when examining the x-x type with a bitwise type. Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-01-13tile: default to little endian on older toolchainsChris Metcalf
Older toolchains may not specify __LITTLE_ENDIAN__, but older toolchains were all little endian. Don't make things unnecessarily hard for those toolchains. Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-01-06rcu: Make SRCU optional by using CONFIG_SRCUPranith Kumar
SRCU is not necessary to be compiled by default in all cases. For tinification efforts not compiling SRCU unless necessary is desirable. The current patch tries to make compiling SRCU optional by introducing a new Kconfig option CONFIG_SRCU which is selected when any of the components making use of SRCU are selected. If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.o Size of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after so the savings are about ~2000 bytes. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]
2014-12-16Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tileLinus Torvalds
Pull arch/tile updates from Chris Metcalf: "Note that one of the changes converts my old cmetcalf@tilera.com email in MAINTAINERS to the cmetcalf@ezchip.com email that you see on this email" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: arch/tile: update MAINTAINERS email to EZchip tile: avoid undefined behavior with regs[TREG_TP] etc arch: tile: kernel: kgdb.c: Use memcpy() instead of pointer copy one by one tile: Use the more common pr_warn instead of pr_warning arch: tile: gxio: Export symbols for module using in 'mpipe.c' arch: tile: kernel: signal.c: Use __copy_from/to_user() instead of __get/put_user()
2014-12-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextLinus Torvalds
Pull networking updates from David Miller: 1) New offloading infrastructure and example 'rocker' driver for offloading of switching and routing to hardware. This work was done by a large group of dedicated individuals, not limited to: Scott Feldman, Jiri Pirko, Thomas Graf, John Fastabend, Jamal Hadi Salim, Andy Gospodarek, Florian Fainelli, Roopa Prabhu 2) Start making the networking operate on IOV iterators instead of modifying iov objects in-situ during transfers. Thanks to Al Viro and Herbert Xu. 3) A set of new netlink interfaces for the TIPC stack, from Richard Alpe. 4) Remove unnecessary looping during ipv6 routing lookups, from Martin KaFai Lau. 5) Add PAUSE frame generation support to gianfar driver, from Matei Pavaluca. 6) Allow for larger reordering levels in TCP, which are easily achievable in the real world right now, from Eric Dumazet. 7) Add a variable of napi_schedule that doesn't need to disable cpu interrupts, from Eric Dumazet. 8) Use a doubly linked list to optimize neigh_parms_release(), from Nicolas Dichtel. 9) Various enhancements to the kernel BPF verifier, and allow eBPF programs to actually be attached to sockets. From Alexei Starovoitov. 10) Support TSO/LSO in sunvnet driver, from David L Stevens. 11) Allow controlling ECN usage via routing metrics, from Florian Westphal. 12) Remote checksum offload, from Tom Herbert. 13) Add split-header receive, BQL, and xmit_more support to amd-xgbe driver, from Thomas Lendacky. 14) Add MPLS support to openvswitch, from Simon Horman. 15) Support wildcard tunnel endpoints in ipv6 tunnels, from Steffen Klassert. 16) Do gro flushes on a per-device basis using a timer, from Eric Dumazet. This tries to resolve the conflicting goals between the desired handling of bulk vs. RPC-like traffic. 17) Allow userspace to ask for the CPU upon what a packet was received/steered, via SO_INCOMING_CPU. From Eric Dumazet. 18) Limit GSO packets to half the current congestion window, from Eric Dumazet. 19) Add a generic helper so that all drivers set their RSS keys in a consistent way, from Eric Dumazet. 20) Add xmit_more support to enic driver, from Govindarajulu Varadarajan. 21) Add VLAN packet scheduler action, from Jiri Pirko. 22) Support configurable RSS hash functions via ethtool, from Eyal Perry. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1820 commits) Fix race condition between vxlan_sock_add and vxlan_sock_release net/macb: fix compilation warning for print_hex_dump() called with skb->mac_header net/mlx4: Add support for A0 steering net/mlx4: Refactor QUERY_PORT net/mlx4_core: Add explicit error message when rule doesn't meet configuration net/mlx4: Add A0 hybrid steering net/mlx4: Add mlx4_bitmap zone allocator net/mlx4: Add a check if there are too many reserved QPs net/mlx4: Change QP allocation scheme net/mlx4_core: Use tasklet for user-space CQ completion events net/mlx4_core: Mask out host side virtualization features for guests net/mlx4_en: Set csum level for encapsulated packets be2net: Export tunnel offloads only when a VxLAN tunnel is created gianfar: Fix dma check map error when DMA_API_DEBUG is enabled cxgb4/csiostor: Don't use MASTER_MUST for fw_hello call net: fec: only enable mdio interrupt before phy device link up net: fec: clear all interrupt events to support i.MX6SX net: fec: reset fep link status in suspend function net: sock: fix access via invalid file descriptor net: introduce helper macro for_each_cmsghdr ...
2014-12-10tile: use pr_warn instead of pr_warningJoe Perches
Use the more common pr_warn. Coalesce formats, realign arguments. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-10tile: neaten early_printk usesJoe Perches
Coalesce the formats and align arguments. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-10printk: remove used-once early_vprintkJoe Perches
Eliminate the unlikely possibility of message interleaving for early_printk/early_vprintk use. early_vprintk can be done via the %pV extension so remove this unnecessary function and change early_printk to have the equivalent vprintk code. All uses of early_printk already end with a newline so also remove the unnecessary newline from the early_printk function. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-10net, lib: kill arch_fast_hash library bitsDaniel Borkmann
As there are now no remaining users of arch_fast_hash(), lets kill it entirely. This basically reverts commit 71ae8aac3e19 ("lib: introduce arch optimized hash library") and follow-up work, that is f.e., commit 237217546d44 ("lib: hash: follow-up fixups for arch hash"), commit e3fec2f74f7f ("lib: Add missing arch generic-y entries for asm-generic/hash.h") and last but not least commit 6a02652df511 ("perf tools: Fix include for non x86 architectures"). Cc: Francesco Fusco <fusco@ntop.org> Cc: Thomas Graf <tgraf@suug.ch> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-10Merge branch 'irq-irqdomain-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull irq domain updates from Thomas Gleixner: "The real interesting irq updates: - Support for hierarchical irq domains: For complex interrupt routing scenarios where more than one interrupt related chip is involved we had no proper representation in the generic interrupt infrastructure so far. That made people implement rather ugly constructs in their nested irq chip implementations. The main offenders are x86 and arm/gic. To distangle that mess we have now hierarchical irqdomains which seperate the various interrupt chips and connect them via the hierarchical domains. That keeps the domain specific details internal to the particular hierarchy level and removes the criss/cross referencing of chip internals. The resulting hierarchy for a complex x86 system will look like this: vector mapped: 74 msi-0 mapped: 2 dmar-ir-1 mapped: 69 ioapic-1 mapped: 4 ioapic-0 mapped: 20 pci-msi-2 mapped: 45 dmar-ir-0 mapped: 3 ioapic-2 mapped: 1 pci-msi-1 mapped: 2 htirq mapped: 0 Neither ioapic nor pci-msi know about the dmar interrupt remapping between themself and the vector domain. If interrupt remapping is disabled ioapic and pci-msi become direct childs of the vector domain. In hindsight we should have done that years ago, but in hindsight we always know better :) - Support for generic MSI interrupt domain handling We have more and more non PCI related MSI interrupts, so providing a generic infrastructure for this is better than having all affected architectures implementing their own private hacks. - Support for PCI-MSI interrupt domain handling, based on the generic MSI support. This part carries the pci/msi branch from Bjorn Helgaas pci tree to avoid a massive conflict. The PCI/MSI parts are acked by Bjorn. I have two more branches on top of this. The full conversion of x86 to hierarchical domains and a partial conversion of arm/gic" * 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (41 commits) genirq: Move irq_chip_write_msi_msg() helper to core PCI/MSI: Allow an msi_controller to be associated to an irq domain PCI/MSI: Provide mechanism to alloc/free MSI/MSIX interrupt from irqdomain PCI/MSI: Enhance core to support hierarchy irqdomain PCI/MSI: Move cached entry functions to irq core genirq: Provide default callbacks for msi_domain_ops genirq: Introduce msi_domain_alloc/free_irqs() asm-generic: Add msi.h genirq: Add generic msi irq domain support genirq: Introduce callback irq_chip.irq_write_msi_msg genirq: Work around __irq_set_handler vs stacked domains ordering issues irqdomain: Introduce helper function irq_domain_add_hierarchy() irqdomain: Implement a method to automatically call parent domains alloc/free genirq: Introduce helper irq_domain_set_info() to reduce duplicated code genirq: Split out flow handler typedefs into seperate header file genirq: Add IRQ_SET_MASK_OK_DONE to support stacked irqchip genirq: Introduce irq_chip.irq_compose_msi_msg() to support stacked irqchip genirq: Add more helper functions to support stacked irq_chip genirq: Introduce helper functions to support stacked irq_chip irqdomain: Do irq_find_mapping and set_type for hierarchy irqdomain in case OF ...
2014-11-29netpoll: delete defconfig references to obsolete NETPOLL_TRAPPaul Gortmaker
In commit 9c62a68d13119a1ca9718381d97b0cb415ff4e9d ("netpoll: Remove dead packet receive code (CONFIG_NETPOLL_TRAP)") this Kconfig option was removed. So remove references to it from all defconfigs as well. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-23PCI/MSI: Rename mask/unmask_msi_irq treewideThomas Gleixner
The PCI/MSI irq chip callbacks mask/unmask_msi_irq have been renamed to pci_msi_mask/unmask_irq to mark them PCI specific. Rename all usage sites. The conversion helper functions are kept around to avoid conflicts in next and will be removed after merging into mainline. Coccinelle assisted conversion. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: x86@kernel.org Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Murali Karicheri <m-karicheri2@ti.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Mohit Kumar <mohit.kumar@st.com> Cc: Simon Horman <horms@verge.net.au> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Yijing Wang <wangyijing@huawei.com>
2014-11-23PCI/MSI: Rename write_msi_msg() to pci_write_msi_msg()Jiang Liu
Rename write_msi_msg() to pci_write_msi_msg() to mark it as PCI specific. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-11-13tile: avoid undefined behavior with regs[TREG_TP] etcChris Metcalf
Recent compilers warn about accesses to arrays past the end, which is supported for pt_regs and sigcontext with the intended alias past the end of regs[] to sp, tp, and lr using TREG_SP, TREG_TP, and TREG_LR. Make the intended usage explict by providing an anonymous union of regs[56] on the one hand, and a short __regs[53] on the other followed by the sp, tp, and lr fields, so the aliasing is done explicitly and is visible to the compiler. Reviewed-by: Jeff Epler <jepler@unpythonic.net> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2014-11-12arch: tile: kernel: kgdb.c: Use memcpy() instead of pointer copy one by oneChen Gang
Not only memcpy() is faster than pointer copy, but also let code more clearer and simple, which can avoid compiling warning (the original implementation copy registers by exceeding member array border). The related warning (with allmodconfig under tile): CC arch/tile/kernel/kgdb.o arch/tile/kernel/kgdb.c: In function 'sleeping_thread_to_gdb_regs': arch/tile/kernel/kgdb.c:140:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations] *(ptr++) = thread_regs->regs[reg]; ^ arch/tile/kernel/kgdb.c:139:2: note: containing loop for (reg = 0; reg <= TREG_LAST_GPR; reg++) ^ Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2014-11-11tile: Use the more common pr_warn instead of pr_warningJoe Perches
And other message logging neatening. Other miscellanea: o coalesce formats o realign arguments o standardize a couple of macros o use __func__ instead of embedding the function name Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-11-11arch: tile: gxio: Export symbols for module using in 'mpipe.c'Chen Gang
'gxio_mpipe_adjust_timestamp', 'gxio_mpipe_link_instance', 'gxio_mpipe_get_timestamp', and 'gxio_mpipe_set_timestamp' may be use by other tile modules, so export them. The related error (with allmodconfig under tile): MODPOST 4002 modules ERROR: "gxio_mpipe_link_instance" [drivers/net/ethernet/tile/tile_net.ko] undefined! ERROR: "gxio_mpipe_get_timestamp" [drivers/net/ethernet/tile/tile_net.ko] undefined! ERROR: "gxio_mpipe_set_timestamp" [drivers/net/ethernet/tile/tile_net.ko] undefined! ERROR: "gxio_mpipe_adjust_timestamp" [drivers/net/ethernet/tile/tile_net.ko] undefined! Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-11-04arch: tile: kernel: signal.c: Use __copy_from/to_user() instead of ↵Chen Gang
__get/put_user() setup/restore_sigcontext() want to copy all related registers between user and kernel. So use block copy instead of each registers copy. Then can let code simple and clearer (which can avoid compiler's warning): The related warning (with allmodconfig under tile): CC arch/tile/kernel/signal.o In file included from include/linux/poll.h:11:0, from include/linux/ring_buffer.h:7, from include/linux/ftrace_event.h:5, from include/trace/syscall.h:6, from include/linux/syscalls.h:81, from arch/tile/kernel/signal.c:30: arch/tile/kernel/signal.c: In function 'setup_sigcontext': arch/tile/kernel/signal.c:116:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations] err |= __put_user(regs->regs[i], &sc->gregs[i]); ^ ./arch/tile/include/asm/uaccess.h:236:26: note: in definition of macro '__put_user_asm' : "r" (ptr), "r" (x), "i" (-EFAULT)) ^ ./arch/tile/include/asm/uaccess.h:297:10: note: in expansion of macro '__put_user_8' case 8: __put_user_8(x, ptr, __ret); break; \ ^ arch/tile/kernel/signal.c:116:10: note: in expansion of macro '__put_user' err |= __put_user(regs->regs[i], &sc->gregs[i]); ^ arch/tile/kernel/signal.c:115:2: note: containing loop for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) ^ Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-20tile: io: implement dummy relaxed accessor macros for writesWill Deacon
write{b,w,l,q}_relaxed are implemented by some architectures in order to permit memory-mapped I/O accesses with weaker barrier semantics than the non-relaxed variants. This patch adds dummy macros for the write accessors to tile, in the same vein as the dummy definitions for the relaxed read accessors. Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-10-15Merge branch 'for-3.18-consistent-ops' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu Pull percpu consistent-ops changes from Tejun Heo: "Way back, before the current percpu allocator was implemented, static and dynamic percpu memory areas were allocated and handled separately and had their own accessors. The distinction has been gone for many years now; however, the now duplicate two sets of accessors remained with the pointer based ones - this_cpu_*() - evolving various other operations over time. During the process, we also accumulated other inconsistent operations. This pull request contains Christoph's patches to clean up the duplicate accessor situation. __get_cpu_var() uses are replaced with with this_cpu_ptr() and __this_cpu_ptr() with raw_cpu_ptr(). Unfortunately, the former sometimes is tricky thanks to C being a bit messy with the distinction between lvalues and pointers, which led to a rather ugly solution for cpumask_var_t involving the introduction of this_cpu_cpumask_var_ptr(). This converts most of the uses but not all. Christoph will follow up with the remaining conversions in this merge window and hopefully remove the obsolete accessors" * 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (38 commits) irqchip: Properly fetch the per cpu offset percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t -fix ia64: sn_nodepda cannot be assigned to after this_cpu conversion. Use __this_cpu_write. percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t Revert "powerpc: Replace __get_cpu_var uses" percpu: Remove __this_cpu_ptr clocksource: Replace __this_cpu_ptr with raw_cpu_ptr sparc: Replace __get_cpu_var uses avr32: Replace __get_cpu_var with __this_cpu_write blackfin: Replace __get_cpu_var uses tile: Use this_cpu_ptr() for hardware counters tile: Replace __get_cpu_var uses powerpc: Replace __get_cpu_var uses alpha: Replace __get_cpu_var ia64: Replace __get_cpu_var uses s390: cio driver &__get_cpu_var replacements s390: Replace __get_cpu_var uses mips: Replace __get_cpu_var uses MIPS: Replace __get_cpu_var uses in FPU emulator. arm: Replace __this_cpu_ptr with raw_cpu_ptr ...
2014-10-09Merge branch 'timers-nohz-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer fixes from Ingo Molnar: "Main changes: - Fix the deadlock reported by Dave Jones et al - Clean up and fix nohz_full interaction with arch abilities - nohz init code consolidation/cleanup" * 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: nohz: nohz full depends on irq work self IPI support nohz: Consolidate nohz full init code arm64: Tell irq work about self IPI support arm: Tell irq work about self IPI support x86: Tell irq work about self IPI support irq_work: Force raised irq work to run on irq work interrupt irq_work: Introduce arch_irq_work_has_interrupt() nohz: Move nohz full init call to tick init
2014-10-02tile: add clock_gettime support to vDSOChris Metcalf
This change adds support for clock_gettime with CLOCK_REALTIME and CLOCK_MONOTONIC using vDSO. It also updates the vdso struct nomenclature used for the clocks to match the x86 code to keep it easier to update going forward. We also support the *_COARSE clockid_t, for apps that want speed but aren't concerned about fine-grained timestamps; this saves about 20 cycles per call (see http://lwn.net/Articles/342018/). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: John Stultz <john.stultz@linaro.org>
2014-10-02tile: switch to using seqlocks for the vDSO time codeChris Metcalf
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-02tile gxio: use better string copy primitiveChris Metcalf
Both strncpy and strlcpy suffer from the fact that they do partial copies of strings into the destination when the target buffer is too small. This is frequently pointless since an overflow of the target buffer may make the result invalid. strncpy() makes it relatively hard to even detect the error condition, and with strlcpy() you have to duplicate the buffer size parameter to test to see if the result exceeds it. By returning zero in the failure case, we both make testing for it easy, and by simply not copying anything in that case, we make it mandatory for callers to test the error code. To catch lazy programmers who don't check, we also place a NUL at the start of the destination buffer (if there is space) to ensure that the result is an invalid string. At some point it may make sense to promote strscpy() to a global platform-independent function, but other than the reviewers, no one was interested on LKML, so for now leave the strscpy() function as file-static. Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-02Removed repeated word in commentsKurt McAlpine
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-02tilegx: Enable ARCH_SUPPORTS_ATOMIC_RMWChris Metcalf
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-02tile: Remove tile-specific _sinitdata and _einitdataGeert Uytterhoeven
Use standard __init_begin and __init_end instead. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-10-02tile: use ARRAY_SIZEHimangi Saraogi
ARRAY_SIZE is more concise to use when the size of an array is divided by the size of its type or the size of its first element. The semantic patch that makes this change is as follows: // <smpl> @i@ @@ @@ type T; T[] E; @@ - (sizeof(E)/sizeof(T)) + ARRAY_SIZE(E) // </smpl> Signed-off-by: Himangi Saraogi <himangi774@gmail.com> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-09-13irq_work: Introduce arch_irq_work_has_interrupt()Peter Zijlstra
The nohz full code needs irq work to trigger its own interrupt so that the subsystem can work even when the tick is stopped. Lets introduce arch_irq_work_has_interrupt() that archs can override to tell about their support for this ability. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2014-08-29flush_icache_range: export symbol to fix build errorsPranith Kumar
Fix building errors occuring due to a missing export of flush_icache_range() in kisskb.ellerman.id.au/kisskb/buildresult/11677809/ ERROR: "flush_icache_range" [drivers/misc/lkdtm.ko] undefined! Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon] Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Chris Zankel <chris@zankel.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa] Cc: Noam Camus <noamc@ezchip.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Zhigang Lu <zlu@tilera.com> [tile] Cc: Kirill Tkhai <tkhai@yandex.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-29kexec: remove CONFIG_KEXEC dependency on cryptoVivek Goyal
New system call depends on crypto. As it did not have a separate config option, CONFIG_KEXEC was modified to select CRYPTO and CRYPTO_SHA256. But now previous patch introduced a new config option for new syscall. So CONFIG_KEXEC does not require crypto. Remove that dependency. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Shaun Ruffell <sruffell@digium.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-26tile: Use this_cpu_ptr() for hardware countersChristoph Lameter
Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-26tile: Replace __get_cpu_var usesChristoph Lameter
__get_cpu_var() is used for multiple purposes in the kernel source. One of them is address calculation via the form &__get_cpu_var(x). This calculates the address for the instance of the percpu variable of the current processor based on an offset. Other use cases are for storing and retrieving data from the current processors percpu area. __get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment. __get_cpu_var() is defined as : #define __get_cpu_var(var) (*this_cpu_ptr(&(var))) __get_cpu_var() always only does an address determination. However, store and retrieve operations could use a segment prefix (or global register on other platforms) to avoid the address calculation. this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use optimized assembly code to read and write per cpu variables. This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr() or into a use of this_cpu operations that use the offset. Thereby address calculations are avoided and less registers are used when code is generated. At the end of the patch set all uses of __get_cpu_var have been removed so the macro is removed too. The patch set includes passes over all arches as well. Once these operations are used throughout then specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by f.e. using a global register that may be set to the per cpu base. Transformations done to __get_cpu_var() 1. Determine the address of the percpu instance of the current processor. DEFINE_PER_CPU(int, y); int *x = &__get_cpu_var(y); Converts to int *x = this_cpu_ptr(&y); 2. Same as #1 but this time an array structure is involved. DEFINE_PER_CPU(int, y[20]); int *x = __get_cpu_var(y); Converts to int *x = this_cpu_ptr(y); 3. Retrieve the content of the current processors instance of a per cpu variable. DEFINE_PER_CPU(int, y); int x = __get_cpu_var(y) Converts to int x = __this_cpu_read(y); 4. Retrieve the content of a percpu struct DEFINE_PER_CPU(struct mystruct, y); struct mystruct x = __get_cpu_var(y); Converts to memcpy(&x, this_cpu_ptr(&y), sizeof(x)); 5. Assignment to a per cpu variable DEFINE_PER_CPU(int, y) __get_cpu_var(y) = x; Converts to __this_cpu_write(y, x); 6. Increment/Decrement etc of a per cpu variable DEFINE_PER_CPU(int, y); __get_cpu_var(y)++ Converts to __this_cpu_inc(y) Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-09Merge branch 'signal-cleanup' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc Pull arch signal handling cleanup from Richard Weinberger: "This patch series moves all remaining archs to the get_signal(), signal_setup_done() and sigsp() functions. Currently these archs use open coded variants of the said functions. Further, unused parameters get removed from get_signal_to_deliver(), tracehook_signal_handler() and signal_delivered(). At the end of the day we save around 500 lines of code." * 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc: (43 commits) powerpc: Use sigsp() openrisc: Use sigsp() mn10300: Use sigsp() mips: Use sigsp() microblaze: Use sigsp() metag: Use sigsp() m68k: Use sigsp() m32r: Use sigsp() hexagon: Use sigsp() frv: Use sigsp() cris: Use sigsp() c6x: Use sigsp() blackfin: Use sigsp() avr32: Use sigsp() arm64: Use sigsp() arc: Use sigsp() sas_ss_flags: Remove nested ternary if Rip out get_signal_to_deliver() Clean up signal_delivered() tracehook_signal_handler: Remove sig, info, ka and regs ...
2014-08-08kexec: load and relocate purgatory at kernel load timeVivek Goyal
Load purgatory code in RAM and relocate it based on the location. Relocation code has been inspired by module relocation code and purgatory relocation code in kexec-tools. Also compute the checksums of loaded kexec segments and store them in purgatory. Arch independent code provides this functionality so that arch dependent bootloaders can make use of it. Helper functions are provided to get/set symbol values in purgatory which are used by bootloaders later to set things like stack and entry point of second kernel etc. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate areaAndy Lutomirski
The core mm code will provide a default gate area based on FIXADDR_USER_START and FIXADDR_USER_END if !defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR). This default is only useful for ia64. arm64, ppc, s390, sh, tile, 64-bit UML, and x86_32 have their own code just to disable it. arm, 32-bit UML, and x86_64 have gate areas, but they have their own implementations. This gets rid of the default and moves the code into ia64. This should save some code on architectures without a gate area: it's now possible to inline the gate_area functions in the default case. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Acked-by: Nathan Lynch <nathan_lynch@mentor.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [in principle] Acked-by: Richard Weinberger <richard@nod.at> [for um] Acked-by: Will Deacon <will.deacon@arm.com> [for arm64] Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Nathan Lynch <Nathan_Lynch@mentor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>