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Subject[PATCH 2.6.17-rc5 3/8] Add the memory allocation/freeing hooks for kmemleak
Date
From: Catalin Marinas <catalin.marinas@arm.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@arm.com>
---

drivers/base/platform.c | 1 +
include/linux/slab.h | 4 ++++
mm/page_alloc.c | 2 ++
mm/slab.c | 22 ++++++++++++++++++++--
mm/vmalloc.c | 24 ++++++++++++++++++++++--
5 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 83f5c59..ee5986a 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -166,6 +166,7 @@ struct platform_device *platform_device_
struct platform_object *pa;

pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
+ memleak_resize(pa, sizeof(struct platform_object));
if (pa) {
strcpy(pa->name, name);
pa->pdev.name = pa->name;
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 2d985d5..aa37216 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -89,6 +89,7 @@ #endif

static inline void *kmalloc(size_t size, gfp_t flags)
{
+#ifndef CONFIG_DEBUG_MEMLEAK
if (__builtin_constant_p(size)) {
int i = 0;
#define CACHE(x) \
@@ -107,6 +108,7 @@ found:
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
}
+#endif
return __kmalloc(size, flags);
}

@@ -114,6 +116,7 @@ extern void *__kzalloc(size_t, gfp_t);

static inline void *kzalloc(size_t size, gfp_t flags)
{
+#ifndef CONFIG_DEBUG_MEMLEAK
if (__builtin_constant_p(size)) {
int i = 0;
#define CACHE(x) \
@@ -132,6 +135,7 @@ 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 253a450..4a65aa9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2800,6 +2800,8 @@ 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 f1b644e..0d38f74 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2878,6 +2878,7 @@ #endif
STATS_INC_ALLOCMISS(cachep);
objp = cache_alloc_refill(cachep, flags);
}
+ memleak_erase(ac->entry[ac->avail]);
return objp;
}

@@ -3143,7 +3144,11 @@ #endif
*/
void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
{
- return __cache_alloc(cachep, flags, __builtin_return_address(0));
+ void *ptr = __cache_alloc(cachep, flags, __builtin_return_address(0));
+
+ memleak_alloc(ptr, cachep->obj_size, 1);
+
+ return ptr;
}
EXPORT_SYMBOL(kmem_cache_alloc);

@@ -3158,6 +3163,9 @@ EXPORT_SYMBOL(kmem_cache_alloc);
void *kmem_cache_zalloc(struct kmem_cache *cache, gfp_t flags)
{
void *ret = __cache_alloc(cache, flags, __builtin_return_address(0));
+
+ memleak_alloc(ret, cache->obj_size, 1);
+
if (ret)
memset(ret, 0, obj_size(cache));
return ret;
@@ -3279,6 +3287,7 @@ 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_.
@@ -3288,7 +3297,11 @@ 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_alloc(ptr, size, 1);
+
+ return ptr;
}


@@ -3372,6 +3385,9 @@ void kmem_cache_free(struct kmem_cache *
unsigned long flags;

local_irq_save(flags);
+
+ memleak_free(objp);
+
__cache_free(cachep, objp);
local_irq_restore(flags);
}
@@ -3395,6 +3411,8 @@ void kfree(const void *objp)
return;
local_irq_save(flags);
kfree_debugcheck(objp);
+ memleak_free(objp);
+
c = virt_to_cache(objp);
mutex_debug_check_no_locks_freed(objp, obj_size(c));
__cache_free(c, (void *)objp);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c0504f1..b7a9db3 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -349,6 +349,9 @@ void __vunmap(void *addr, int deallocate
void vfree(void *addr)
{
BUG_ON(in_interrupt());
+
+ memleak_free(addr);
+
__vunmap(addr, 1);
}
EXPORT_SYMBOL(vfree);
@@ -447,7 +450,14 @@ 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;
}

/**
@@ -466,6 +476,10 @@ void *__vmalloc_node(unsigned long size,
int node)
{
struct vm_struct *area;
+ void *addr;
+#ifdef CONFIG_DEBUG_MEMLEAK
+ unsigned long real_size = size;
+#endif

size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > num_physpages)
@@ -475,7 +489,13 @@ 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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