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Commit 40779859 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  SLAB: Record actual last user of freed objects.
  slub: always align cpu_slab to honor cmpxchg_double requirement
parents ffdb8f1b a947eb95

include/linux/percpu.h

+3 −0
Original line number Diff line number Diff line
@@ -259,6 +259,9 @@ extern void __bad_size_call_parameter(void); 
 * Special handling for cmpxchg_double.  cmpxchg_double is passed two

 * percpu variables.  The first has to be aligned to a double word

 * boundary and the second has to follow directly thereafter.

 * We enforce this on all architectures even if they don't support

 * a double cmpxchg instruction, since it's a cheap requirement, and it

 * avoids breaking the requirement for architectures with the instruction.

 */

#define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)		\

({									\

mm/slab.c

+5 −4
Original line number Diff line number Diff line
@@ -3604,13 +3604,14 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) 
 * Release an obj back to its cache. If the obj has a constructed state, it must

 * be in this state _before_ it is released.  Called with disabled ints.

 */

static inline void __cache_free(struct kmem_cache *cachep, void *objp)

static inline void __cache_free(struct kmem_cache *cachep, void *objp,

    void *caller)

{

	struct array_cache *ac = cpu_cache_get(cachep);



	check_irq_off();

	kmemleak_free_recursive(objp, cachep->flags);

	objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));

	objp = cache_free_debugcheck(cachep, objp, caller);



	kmemcheck_slab_free(cachep, objp, obj_size(cachep));
@@ -3801,7 +3802,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp) 
	debug_check_no_locks_freed(objp, obj_size(cachep));

	if (!(cachep->flags & SLAB_DEBUG_OBJECTS))

		debug_check_no_obj_freed(objp, obj_size(cachep));

	__cache_free(cachep, objp);

	__cache_free(cachep, objp, __builtin_return_address(0));

	local_irq_restore(flags);



	trace_kmem_cache_free(_RET_IP_, objp);
@@ -3831,7 +3832,7 @@ void kfree(const void *objp) 
	c = virt_to_cache(objp);

	debug_check_no_locks_freed(objp, obj_size(c));

	debug_check_no_obj_freed(objp, obj_size(c));

	__cache_free(c, (void *)objp);

	__cache_free(c, (void *)objp, __builtin_return_address(0));

	local_irq_restore(flags);

}

EXPORT_SYMBOL(kfree);

mm/slub.c

+4 −8
Original line number Diff line number Diff line
@@ -2320,16 +2320,12 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) 
	BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE <

			SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu));



#ifdef CONFIG_CMPXCHG_LOCAL

	/*

	 * Must align to double word boundary for the double cmpxchg instructions

	 * to work.

	 * Must align to double word boundary for the double cmpxchg

	 * instructions to work; see __pcpu_double_call_return_bool().

	 */

	s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), 2 * sizeof(void *));

#else

	/* Regular alignment is sufficient */

	s->cpu_slab = alloc_percpu(struct kmem_cache_cpu);

#endif

	s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu),

				     2 * sizeof(void *));



	if (!s->cpu_slab)

		return 0;