diff options
| author | Will Deacon <will.deacon@arm.com> | 2017-08-10 14:10:28 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 20:06:33 +0100 |
| commit | 75802ca67d6b1a07c355e1034a5f2f756c4a66d0 (patch) | |
| tree | c5502d1bff7c902791334ef5ca035afd32c891c0 /arch/arm64/include/asm/mmu.h | |
| parent | 9c3ad6e6b8277d9e78e26628718b76425fc37291 (diff) | |
arm64: mm: Allocate ASIDs in pairs
Commit 0c8ea531b774 upstream.
In preparation for separate kernel/user ASIDs, allocate them in pairs
for each mm_struct. The bottom bit distinguishes the two: if it is set,
then the ASID will map only userspace.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/include/asm/mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/mmu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 0d34bf0a89c7..01bfb184f2a8 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -17,6 +17,7 @@ #define __ASM_MMU_H #define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */ +#define USER_ASID_FLAG (UL(1) << 48) typedef struct { atomic64_t id; |