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| author | Muchun Song <songmuchun@bytedance.com> | 2022-03-22 22:41:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-22 23:57:04 +0100 |
| commit | 5cbcf2258b71cbae358961796c3a879e1b06a9ff (patch) | |
| tree | b456732a60058de0df85d25cfffbeb106d3b114a | |
| parent | mm: remove mmu_gathers storage from remaining architectures (diff) | |
| download | linux-5cbcf2258b71cbae358961796c3a879e1b06a9ff.tar.xz linux-5cbcf2258b71cbae358961796c3a879e1b06a9ff.zip | |
mm: thp: fix wrong cache flush in remove_migration_pmd()
Patch series "Fix some cache flush bugs", v5.
This series focuses on fixing cache maintenance.
This patch (of 7):
The flush_cache_range() is supposed to be justified only if the page is
already placed in process page table, and that is done right after
flush_cache_range(). So using this interface is wrong. And there is no
need to invalite cache since it was non-present before in
remove_migration_pmd(). So just to remove it.
Link: https://lkml.kernel.org/r/20220210123058.79206-1-songmuchun@bytedance.com
Link: https://lkml.kernel.org/r/20220210123058.79206-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Lars Persson <lars.persson@axis.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Cc: Fam Zheng <fam.zheng@bytedance.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/huge_memory.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 406a3c28c026..88fe13a7f8e2 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3197,7 +3197,6 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) if (pmd_swp_uffd_wp(*pvmw->pmd)) pmde = pmd_wrprotect(pmd_mkuffd_wp(pmde)); - flush_cache_range(vma, mmun_start, mmun_start + HPAGE_PMD_SIZE); if (PageAnon(new)) page_add_anon_rmap(new, vma, mmun_start, true); else @@ -3205,6 +3204,8 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) set_pmd_at(mm, mmun_start, pvmw->pmd, pmde); if ((vma->vm_flags & VM_LOCKED) && !PageDoubleMap(new)) mlock_vma_page(new); + + /* No need to invalidate - it was non-present before */ update_mmu_cache_pmd(vma, address, pvmw->pmd); } #endif |