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| author | Hugh Dickins <hughd@google.com> | 2023-08-23 08:14:47 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-25 00:59:47 +0300 |
| commit | e5548f85b4527c4c803b7eae7887c10bf8f90c97 (patch) | |
| tree | e89cd6f78cdd98fedad9054d38f517249240016c /mm/madvise.c | |
| parent | f84f62e69963d7742acec4340ec1c4c7ef22b887 (diff) | |
| download | linux-e5548f85b4527c4c803b7eae7887c10bf8f90c97.tar.xz | |
shmem: fix smaps BUG sleeping while atomic
smaps_pte_hole_lookup() is calling shmem_partial_swap_usage() with page
table lock held: but shmem_partial_swap_usage() does cond_resched_rcu() if
need_resched(): "BUG: sleeping function called from invalid context".
Since shmem_partial_swap_usage() is designed to count across a range, but
smaps_pte_hole_lookup() only calls it for a single page slot, just break
out of the loop on the last or only page, before checking need_resched().
Link: https://lkml.kernel.org/r/6fe3b3ec-abdf-332f-5c23-6a3b3a3b11a9@google.com
Fixes: 230100321518 ("mm/smaps: simplify shmem handling of pte holes")
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org> [5.16+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
0 files changed, 0 insertions, 0 deletions