Add vzalloc for convinience of vmalloc-then-memset-zero case
Use __GFP_ZERO in vzalloc to zero fill the allocated memory.
Signed-off-by: Dave Young <hidave.darkstar@xxxxxxxxx>
---
include/linux/vmalloc.h | 1 +
mm/vmalloc.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
--- linux-2.6.orig/include/linux/vmalloc.h 2010-08-22 15:31:38.000000000 +0800
+++ linux-2.6/include/linux/vmalloc.h 2010-10-16 10:50:54.739996121 +0800
@@ -53,6 +53,7 @@ static inline void vmalloc_init(void)
#endif
extern void *vmalloc(unsigned long size);
+extern void *vzalloc(unsigned long size);
extern void *vmalloc_user(unsigned long size);
extern void *vmalloc_node(unsigned long size, int node);
extern void *vmalloc_exec(unsigned long size);
--- linux-2.6.orig/mm/vmalloc.c 2010-08-22 15:31:39.000000000 +0800
+++ linux-2.6/mm/vmalloc.c 2010-10-16 10:51:57.126665918 +0800
@@ -1604,6 +1604,19 @@ void *vmalloc(unsigned long size)
EXPORT_SYMBOL(vmalloc);
/**
+ * vzalloc - allocate virtually contiguous memory with zero filled
+ * @size: allocation size
+ * Allocate enough pages to cover @size from the page level
+ * allocator and map them into contiguous kernel virtual space.
+ */
+void *vzalloc(unsigned long size)
+{
+ return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
+ PAGE_KERNEL, -1, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(vzalloc);
+
+/**
* vmalloc_user - allocate zeroed virtually contiguous memory for userspace
* @size: allocation size
*
--
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