Changeset 25ebfbd in mainline for kernel/generic/include/mm/slab.h

Timestamp:

2012-05-06T19:34:33Z (12 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c8d0f9e5

Parents:

1295a1da

Message:

Make slab_mag_cache_t's spinlock IRQ safe.

• slab_cache_destroy() was taking this lock while interrupts were not disabled.
• Some TLB shootdown sequences could allocate memory, which may involve taking the lock.
• The above could lead to a deadlock if one CPU took the lock and another one started the TLB shootdown sequence which also takes this lock.

File:

• kernel/generic/include/mm/slab.h (modified) (1 diff)

kernel/generic/include/mm/slab.h

@@ -81 +81 @@
         slab_magazine_t *current;
         slab_magazine_t *last;
-        SPINLOCK_DECLARE(lock);
+        IRQ_SPINLOCK_DECLARE(lock);
 } slab_mag_cache_t;