Valgrind annotations for the slab allocator: Malloc-like and free-like
for cache_alloc and free. Telling Valgrind a region is free-like clears
all the valid bits, so slabs with constructors need different treatment;
tell Valgrind about slab objects when first constructed and free them
when the slab is destroyed.
Signed-off-by: Steve VanDeBogart <[EMAIL PROTECTED]>
---
Index: linux-2.6.27-rc5/mm/slab.c
===================================================================
--- linux-2.6.27-rc5.orig/mm/slab.c 2008-08-29 14:24:25.000000000 -0700
+++ linux-2.6.27-rc5/mm/slab.c 2008-08-29 14:24:42.000000000 -0700
@@ -111,6 +111,7 @@
#include <linux/rtmutex.h>
#include <linux/reciprocal_div.h>
#include <linux/debugobjects.h>
+#include <linux/memcheck.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
@@ -1906,6 +1907,8 @@
int i;
for (i = 0; i < cachep->num; i++) {
void *objp = index_to_obj(cachep, slabp, i);
+ if (cachep->ctor)
+ VALGRIND_FREELIKE_BLOCK(objp, 0);
if (cachep->flags & SLAB_POISON) {
#ifdef CONFIG_DEBUG_PAGEALLOC
@@ -1932,6 +1935,15 @@
#else
static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct slab
*slabp)
{
+#ifdef CONFIG_VALGRIND_SUPPORT
+ int i;
+ if (cachep->ctor) {
+ for (i = 0; i < cachep->num; i++) {
+ void *objp = index_to_obj(cachep, slabp, i);
+ VALGRIND_FREELIKE_BLOCK(objp, 0);
+ }
+ }
+#endif
}
#endif
@@ -2635,6 +2647,9 @@
for (i = 0; i < cachep->num; i++) {
void *objp = index_to_obj(cachep, slabp, i);
+ if (cachep->ctor)
+ VALGRIND_MALLOCLIKE_BLOCK(objp, cachep->buffer_size,
+ 0, 0);
#if DEBUG
/* need to poison the objs? */
if (cachep->flags & SLAB_POISON)
@@ -3466,6 +3481,8 @@
objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller);
prefetchw(objp);
+ if (!cachep->ctor)
+ VALGRIND_MALLOCLIKE_BLOCK(objp, cachep->buffer_size, 0, 0);
if (unlikely((flags & __GFP_ZERO) && objp))
memset(objp, 0, obj_size(cachep));
@@ -3578,6 +3595,9 @@
{
struct array_cache *ac = cpu_cache_get(cachep);
+ if (!cachep->ctor)
+ VALGRIND_FREELIKE_BLOCK(objp, 0);
+
check_irq_off();
objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
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