[PATCH 06/14] kmemleak: Add the vmalloc memory allocation/freeing hooks

Catalin Marinas
2009-04-24T16:43:22Z

This patch adds the callbacks to kmemleak_(alloc|free) functions from
vmalloc/vfree.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
mm/vmalloc.c | 30 +++++++++++++++++++++++++++---
1 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index fab1987..507f1b1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -25,6 +25,7 @@
#include <linux/rcupdate.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
+#include <linux/kmemleak.h>

#include <asm/atomic.h>
#include <asm/uaccess.h>
@@ -1326,6 +1327,9 @@ static void __vunmap(const void *addr, int deallocate_pages)
void vfree(const void *addr)
{
BUG_ON(in_interrupt());
+
+ kmemleak_free(addr);
+
__vunmap(addr, 1);
}
EXPORT_SYMBOL(vfree);
@@ -1438,8 +1442,17 @@ fail:

void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot)
{
- return __vmalloc_area_node(area, gfp_mask, prot, -1,
- __builtin_return_address(0));
+ void *addr = __vmalloc_area_node(area, gfp_mask, prot, -1,
+ __builtin_return_address(0));
+
+ /*
+ * A ref_count = 3 is needed because the vm_struct and vmap_area
+ * structures allocated in the __get_vm_area_node() function contain
+ * references to the virtual address of the vmalloc'ed block.
+ */
+ kmemleak_alloc(addr, area->size - PAGE_SIZE, 3, gfp_mask);
+
+ return addr;
}

/**
@@ -1458,6 +1471,8 @@ static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
int node, void *caller)
{
struct vm_struct *area;
+ void *addr;
+ unsigned long real_size = size;

size = PAGE_ALIGN(size);
if (!size || (size >> PAGE_SHIFT) > num_physpages)
@@ -1469,7 +1484,16 @@ static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot,
if (!area)
return NULL;

- return __vmalloc_area_node(area, gfp_mask, prot, node, caller);
+ addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
+
+ /*
+ * A ref_count = 3 is needed because the vm_struct and vmap_area
+ * structures allocated in the __get_vm_area_node() function contain
+ * references to the virtual address of the vmalloc'ed block.
+ */
+ kmemleak_alloc(addr, real_size, 3, gfp_mask);
+
+ return addr;
}

void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)