Commit fd4d9c7d authored by Jann Horn's avatar Jann Horn Committed by Linus Torvalds

mm: slub: add missing TID bump in kmem_cache_alloc_bulk()

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: ebe909e0 ("slub: improve bulk alloc strategy")
Signed-off-by: default avatarJann Horn <jannh@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ac309e77
......@@ -3174,6 +3174,15 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
void *object = c->freelist;
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
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment