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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2023-03-12 14:26:04 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2023-03-16 13:08:40 -0700 |
| commit | f7d304343b9d2456ffba23b99d2345408251ea45 (patch) | |
| tree | c7e5315aaeaac40909084a5784a0536c858091b6 /arch/arm64/include | |
| parent | 2f8794bd087e7958c8d1f0a0538856ca03e0bf3c (diff) | |
| download | linux-stable-f7d304343b9d2456ffba23b99d2345408251ea45.tar.gz linux-stable-f7d304343b9d2456ffba23b99d2345408251ea45.tar.bz2 linux-stable-f7d304343b9d2456ffba23b99d2345408251ea45.zip | |
mm: Expose untagging mask in /proc/$PID/status
Add a line in /proc/$PID/status to report untag_mask. It can be
used to find out LAM status of the process from the outside. It is
useful for debuggers.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Alexander Potapenko <glider@google.com>
Link: https://lore.kernel.org/all/20230312112612.31869-10-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/mmu_context.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index 72dbd6400549..56911691bef0 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -288,6 +288,12 @@ void post_ttbr_update_workaround(void); unsigned long arm64_mm_context_get(struct mm_struct *mm); void arm64_mm_context_put(struct mm_struct *mm); +#define mm_untag_mask mm_untag_mask +static inline unsigned long mm_untag_mask(struct mm_struct *mm) +{ + return -1UL >> 8; +} + #include <asm-generic/mmu_context.h> #endif /* !__ASSEMBLY__ */ |