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Message-Id: <20060906223643.21550.28561.stgit@localhost.localdomain>
Date: Wed, 06 Sep 2006 23:36:44 +0100
From: Catalin Marinas <catalin.marinas@...il.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.18-rc6 03/10] Add the memory allocation/freeing hooks for kmemleak
From: Catalin Marinas <catalin.marinas@....com>
This patch adds the callbacks to memleak_(alloc|free) functions from
kmalloc/kfree, kmem_cache_(alloc|free), vmalloc/vfree etc.
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---
include/linux/slab.h | 6 ++++++
mm/page_alloc.c | 2 ++
mm/slab.c | 19 +++++++++++++++++--
mm/vmalloc.c | 22 ++++++++++++++++++++--
4 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 45ad55b..e3f5945 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -133,6 +133,8 @@ #endif
*/
static inline void *kmalloc(size_t size, gfp_t flags)
{
+#ifndef CONFIG_DEBUG_MEMLEAK
+ /* this block removes the size information needed by kmemleak */
if (__builtin_constant_p(size)) {
int i = 0;
#define CACHE(x) \
@@ -151,6 +153,7 @@ found:
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
}
+#endif
return __kmalloc(size, flags);
}
@@ -163,6 +166,8 @@ extern void *__kzalloc(size_t, gfp_t);
*/
static inline void *kzalloc(size_t size, gfp_t flags)
{
+#ifndef CONFIG_DEBUG_MEMLEAK
+ /* this block removes the size information needed by kmemleak */
if (__builtin_constant_p(size)) {
int i = 0;
#define CACHE(x) \
@@ -181,6 +186,7 @@ found:
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
}
+#endif
return __kzalloc(size, flags);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 54a4f53..bdf6445 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2450,6 +2450,8 @@ void *__init alloc_large_system_hash(con
if (_hash_mask)
*_hash_mask = (1 << log2qty) - 1;
+ memleak_alloc(table, size, 1);
+
return table;
}
diff --git a/mm/slab.c b/mm/slab.c
index 21ba060..0dd753c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2446,6 +2446,9 @@ static struct slab *alloc_slabmgmt(struc
/* Slab management obj is off-slab. */
slabp = kmem_cache_alloc_node(cachep->slabp_cache,
local_flags, nodeid);
+ /* only scan the list member to avoid false negatives */
+ memleak_scan_area(slabp, offsetof(struct slab, list),
+ sizeof(struct list_head));
if (!slabp)
return NULL;
} else {
@@ -2986,6 +2989,8 @@ #endif
STATS_INC_ALLOCMISS(cachep);
objp = cache_alloc_refill(cachep, flags);
}
+ /* avoid false negatives */
+ memleak_erase(&ac->entry[ac->avail]);
return objp;
}
@@ -3002,6 +3007,7 @@ static __always_inline void *__cache_all
local_irq_restore(save_flags);
objp = cache_alloc_debugcheck_after(cachep, flags, objp,
caller);
+ memleak_alloc(objp, obj_size(cachep), 1);
prefetchw(objp);
return objp;
}
@@ -3193,6 +3199,7 @@ static inline void __cache_free(struct k
struct array_cache *ac = cpu_cache_get(cachep);
check_irq_off();
+ memleak_free(objp);
objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
if (cache_free_alien(cachep, objp))
@@ -3312,6 +3319,7 @@ void *kmem_cache_alloc_node(struct kmem_
ptr = cache_alloc_debugcheck_after(cachep, flags, ptr,
__builtin_return_address(0));
+ memleak_alloc(ptr, obj_size(cachep), 1);
return ptr;
}
@@ -3320,11 +3328,14 @@ EXPORT_SYMBOL(kmem_cache_alloc_node);
void *kmalloc_node(size_t size, gfp_t flags, int node)
{
struct kmem_cache *cachep;
+ void *ptr;
cachep = kmem_find_general_cachep(size, flags);
if (unlikely(cachep == NULL))
return NULL;
- return kmem_cache_alloc_node(cachep, flags, node);
+ ptr = kmem_cache_alloc_node(cachep, flags, node);
+ memleak_padding(ptr, 0, size);
+ return ptr;
}
EXPORT_SYMBOL(kmalloc_node);
#endif
@@ -3339,6 +3350,7 @@ static __always_inline void *__do_kmallo
void *caller)
{
struct kmem_cache *cachep;
+ void *ptr;
/* If you want to save a few bytes .text space: replace
* __ with kmem_.
@@ -3348,7 +3360,10 @@ static __always_inline void *__do_kmallo
cachep = __find_general_cachep(size, flags);
if (unlikely(cachep == NULL))
return NULL;
- return __cache_alloc(cachep, flags, caller);
+ ptr = __cache_alloc(cachep, flags, caller);
+ memleak_padding(ptr, 0, size);
+
+ return ptr;
}
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 266162d..a4d319f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -364,6 +364,9 @@ void __vunmap(void *addr, int deallocate
void vfree(void *addr)
{
BUG_ON(in_interrupt());
+
+ memleak_free(addr);
+
__vunmap(addr, 1);
}
EXPORT_SYMBOL(vfree);
@@ -463,7 +466,14 @@ fail:
void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
{
- return __vmalloc_area_node(area, gfp_mask, prot, -1);
+ void *addr = __vmalloc_area_node(area, gfp_mask, prot, -1);
+
+ /* this needs ref_count = 2 since vm_struct also contains a
+ * pointer to this address. The guard page is also subtracted
+ * from the size */
+ memleak_alloc(addr, area->size - PAGE_SIZE, 2);
+
+ return addr;
}
/**
@@ -482,6 +492,8 @@ void *__vmalloc_node(unsigned long size,
int node)
{
struct vm_struct *area;
+ void *addr;
+ unsigned long real_size = size;
size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > num_physpages)
@@ -491,7 +503,13 @@ void *__vmalloc_node(unsigned long size,
if (!area)
return NULL;
- return __vmalloc_area_node(area, gfp_mask, prot, node);
+ addr = __vmalloc_area_node(area, gfp_mask, prot, node);
+
+ /* this needs ref_count = 2 since the vm_struct also contains
+ a pointer to this address */
+ memleak_alloc(addr, real_size, 2);
+
+ return addr;
}
EXPORT_SYMBOL(__vmalloc_node);
-
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