diff options
| author | Will Deacon <will@kernel.org> | 2021-01-28 02:53:44 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-01-29 22:02:29 +0300 |
| commit | d8b450530b90f8845ab962af18b8a10ed77fc889 (patch) | |
| tree | 5399ddb38a5f0a743c07866a32bec5ce46175b61 /include/linux/mm_types.h | |
| parent | ae8eba8b5d723a4ca543024b6e51f4d0f4fb6b6b (diff) | |
| download | linux-d8b450530b90f8845ab962af18b8a10ed77fc889.tar.xz | |
tlb: mmu_gather: Introduce tlb_gather_mmu_fullmm()
Passing the range '0, -1' to tlb_gather_mmu() sets the 'fullmm' flag,
which indicates that the mm_struct being operated on is going away. In
this case, some architectures (such as arm64) can elide TLB invalidation
by ensuring that the TLB tag (ASID) associated with this mm is not
immediately reclaimed. Although this behaviour is documented in
asm-generic/tlb.h, it's subtle and easily missed.
Introduce tlb_gather_mmu_fullmm() to make it clearer that this is for the
entire mm and WARN() if tlb_gather_mmu() is called with the 'fullmm'
address range.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Yu Zhao <yuzhao@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lkml.kernel.org/r/20210127235347.1402-4-will@kernel.org
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 1fe6a51298a6..e49868bc12a7 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -590,6 +590,7 @@ static inline cpumask_t *mm_cpumask(struct mm_struct *mm) struct mmu_gather; extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end); +extern void tlb_gather_mmu_fullmm(struct mmu_gather *tlb, struct mm_struct *mm); extern void tlb_finish_mmu(struct mmu_gather *tlb); static inline void init_tlb_flush_pending(struct mm_struct *mm) |