diff options
| author | Yury Norov <ynorov@caviumnetworks.com> | 2015-12-29 12:26:35 +0300 |
|---|---|---|
| committer | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2018-05-29 17:53:07 +0200 |
| commit | 4a72bfd1eb7ab0574c721b0d54915cc64ffa6c73 (patch) | |
| tree | 17d07535872181f83186cb2934b0a8fe2197b024 /arch/Kconfig | |
| parent | c90627fced2f9f596cfaff960f1a42b17c67d014 (diff) | |
32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option
All new 32-bit architectures should have 64-bit userspace off_t type, but
existing architectures has 32-bit ones.
To enforce the rule, new config option is added to arch/Kconfig that defaults
ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing
32-bit architectures enable it explicitly.
New option affects force_o_largefile() behaviour. Namely, if userspace
off_t is 64-bits long, we have no reason to reject user to open big files.
Note that even if architectures has only 64-bit off_t in the kernel
(arc, c6x, h8300, hexagon, metag, nios2, openrisc, tile32 and unicore32),
a libc may use 32-bit off_t, and therefore want to limit the file size
to 4GB unless specified differently in the open flags.
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 76c0b54443b1..ee079244dc3c 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -264,6 +264,21 @@ config ARCH_THREAD_STACK_ALLOCATOR config ARCH_WANTS_DYNAMIC_TASK_STRUCT bool +config ARCH_32BIT_OFF_T + bool + depends on !64BIT + help + All new 32-bit architectures should have 64-bit off_t type on + userspace side which corresponds to the loff_t kernel type. This + is the requirement for modern ABIs. Some existing architectures + already have 32-bit off_t. This option is enabled for all such + architectures explicitly. Namely: arc, arm, blackfin, cris, frv, + h8300, hexagon, m32r, m68k, metag, microblaze, mips32, mn10300, + nios2, openrisc, parisc32, powerpc32, score, sh, sparc, tile32, + unicore32, x86_32 and xtensa. This is the complete list. Any + new 32-bit architecture should declare 64-bit off_t type on user + side and so should not enable this option. + config HAVE_REGS_AND_STACK_ACCESS_API bool help |