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| author | Jann Horn <jannh@google.com> | 2020-03-17 03:28:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-21 10:11:58 +0300 |
| commit | ae119b7e12472517bc35c1c003d5abf26653674a (patch) | |
| tree | a979f7540a8cadb7e3994b1de9b8203c5544e0b1 /mm/slub.c | |
| parent | 47b6d269dbbdbee277f8089ebceae9c9666bd918 (diff) | |
| download | linux-ae119b7e12472517bc35c1c003d5abf26653674a.tar.xz | |
mm: slub: add missing TID bump in kmem_cache_alloc_bulk()
commit fd4d9c7d0c71866ec0c2825189ebd2ce35bd95b8 upstream.
When kmem_cache_alloc_bulk() attempts to allocate N objects from a percpu
freelist of length M, and N > M > 0, it will first remove the M elements
from the percpu freelist, then call ___slab_alloc() to allocate the next
element and repopulate the percpu freelist. ___slab_alloc() can re-enable
IRQs via allocate_slab(), so the TID must be bumped before ___slab_alloc()
to properly commit the freelist head change.
Fix it by unconditionally bumping c->tid when entering the slowpath.
Cc: stable@vger.kernel.org
Fixes: ebe909e0fdb3 ("slub: improve bulk alloc strategy")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c index 20d72cb20515..3ca4a223f44c 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3155,6 +3155,15 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, if (unlikely(!object)) { /* + * We may have removed an object from c->freelist using + * the fastpath in the previous iteration; in that case, + * c->tid has not been bumped yet. + * Since ___slab_alloc() may reenable interrupts while + * allocating memory, we should bump c->tid now. + */ + c->tid = next_tid(c->tid); + + /* * Invoking slow path likely have side-effect * of re-populating per CPU c->freelist */ |