diff options
| author | Alexander Potapenko <glider@google.com> | 2022-11-10 14:35:41 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-01 02:59:02 +0300 |
| commit | f6fbb8b23b8155a6f7af1349b4595d0373167636 (patch) | |
| tree | bdc32d357368304ff25ccaf0da978c53f2caa20d /mm | |
| parent | 7438899b0b8df16a73d9a5d49b2a345d165adfe8 (diff) | |
| download | linux-f6fbb8b23b8155a6f7af1349b4595d0373167636.tar.xz | |
Revert "kmsan: unpoison @tlb in arch_tlb_gather_mmu()"
This reverts commit ac801e7e252c5588325e3c983c7d4167fc68c024.
The patch in question was picked to -mm from the KMSAN v6 patch series
(https://lore.kernel.org/linux-mm/20220905122452.2258262-1-glider@google.com/)
and sneaked into mainline despite its removal from the v7 series
(https://lore.kernel.org/linux-mm/20220915150417.722975-1-glider@google.com/)
Currently KMSAN does not warn about origin chains hitting the maximum
depth, so keeping @tlb poisoned won't result in any inconveniences.
Link: https://lkml.kernel.org/r/20221110113541.1844156-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmu_gather.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c index dd1f8ca40cb5..8247553a69c2 100644 --- a/mm/mmu_gather.c +++ b/mm/mmu_gather.c @@ -1,7 +1,6 @@ #include <linux/gfp.h> #include <linux/highmem.h> #include <linux/kernel.h> -#include <linux/kmsan-checks.h> #include <linux/mmdebug.h> #include <linux/mm_types.h> #include <linux/mm_inline.h> @@ -299,15 +298,6 @@ void tlb_flush_mmu(struct mmu_gather *tlb) static void __tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm) { - /* - * struct mmu_gather contains 7 1-bit fields packed into a 32-bit - * unsigned int value. The remaining 25 bits remain uninitialized - * and are never used, but KMSAN updates the origin for them in - * zap_pXX_range() in mm/memory.c, thus creating very long origin - * chains. This is technically correct, but consumes too much memory. - * Unpoisoning the whole structure will prevent creating such chains. - */ - kmsan_unpoison_memory(tlb, sizeof(*tlb)); tlb->mm = mm; tlb->fullmm = fullmm; |