[PATCH 2/3] kasan: common: use ALIGN_DOWN macro for stack alignment

[Igor Putko]

Replace the manual bitwise alignment logic in
kasan_unpoison_task_stack_below() with the
standard ALIGN_DOWN macro. This improves code
readability and conforms to standard kernel idioms.

Signed-off-by: Igor Putko <igorpetindev@xxxxxxxxx>
---
 mm/kasan/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 34aa0fdce..5faf73c8f 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -119,7 +119,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
 	 * because this function is called by early resume code which hasn't
 	 * yet set up the percpu register (%gs).
 	 */
-	void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1));
+	void *base = (void *)ALIGN_DOWN((unsigned long)watermark, THREAD_SIZE);
 
 	kasan_unpoison(base, watermark - base, false);
 }
-- 
2.47.3