mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-10-22 19:14:51 +00:00
bfe125f1b1
Commitb67fbebd4c("mmu_gather: Force tlb-flush VM_PFNMAP vmas") added a forced tlbflush to tlb_vma_end(), which is required to avoid a race between munmap() and unmap_mapping_range(). However it added some overhead to other paths where tlb_vma_end() is used, but vmas are not removed, e.g. madvise(MADV_DONTNEED). Fix this by moving the tlb flush out of tlb_end_vma() into new tlb_flush_vmas() called from free_pgtables(), somewhat similar to the stable version of the original commit: commit895428ee12("mm: Force TLB flush for PFNMAP mappings before unlink_file_vma()"). Note, that if tlb->fullmm is set, no flush is required, as the whole mm is about to be destroyed. Link: https://lkml.kernel.org/r/20250522012838.163876-1-roman.gushchin@linux.dev Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Reviewed-by: Jann Horn <jannh@google.com> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org> Cc: Nick Piggin <npiggin@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
7218 lines
200 KiB
7218 lines
200 KiB