diff options
| author | Jann Horn <jannh@google.com> | 2024-08-13 22:25:22 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-02 02:59:00 +0200 |
| commit | 4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a (patch) | |
| tree | 8dc1897967f79d74885f6abd07af6de02c538d60 /fs/nilfs2/sysfs.c | |
| parent | userfaultfd: fix checks for huge PMDs (diff) | |
| download | linux-4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a.tar.xz linux-4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a.zip | |
userfaultfd: don't BUG_ON() if khugepaged yanks our page table
Since khugepaged was changed to allow retracting page tables in file
mappings without holding the mmap lock, these BUG_ON()s are wrong - get
rid of them.
We could also remove the preceding "if (unlikely(...))" block, but then we
could reach pte_offset_map_lock() with transhuge pages not just for file
mappings but also for anonymous mappings - which would probably be fine
but I think is not necessarily expected.
Link: https://lkml.kernel.org/r/20240813-uffd-thp-flip-fix-v2-2-5efa61078a41@google.com
Fixes: 1d65b771bc08 ("mm/khugepaged: retract_page_tables() without mmap or vma lock")
Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions