[patch 1/2] x86_64: Clean up stack allocation and free

[clameter@sgi.com]

[-- Attachment #1: x86_64_stack_cleanup --]
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Cleanup the allocation and freeing of stacks a bit by using a __GFP_ZERO
flag instead of memset.

Cc: ak@suse.de
Cc: travis@sgi.com
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 include/asm-x86/thread_info_64.h |   16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

Index: linux-2.6/include/asm-x86/thread_info_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info_64.h	2007-10-12 12:41:32.000000000 -0700
+++ linux-2.6/include/asm-x86/thread_info_64.h	2007-11-06 15:38:22.000000000 -0800
@@ -74,20 +74,14 @@ static inline struct thread_info *stack_
 
 /* thread information allocation */
 #ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk)					\
-    ({								\
-	struct thread_info *ret;				\
-								\
-	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
-	if (ret)						\
-		memset(ret, 0, THREAD_SIZE);			\
-	ret;							\
-    })
+#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
 #else
-#define alloc_thread_info(tsk) \
-	((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
+#define THREAD_FLAGS GFP_KERNEL
 #endif
 
+#define alloc_thread_info(tsk) \
+	((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER))
+
 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
 
 #else /* !__ASSEMBLY__ */

-- 

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