From 298ff6e581295636c5f887c86d6095a1e816b6d4 Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Wed, 10 Oct 2012 20:43:27 +0800
Subject: [PATCH] kmalloc: Use powerof2() to detect power-of-2 size

---
 sys/kern/kern_slaballoc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_slaballoc.c b/sys/kern/kern_slaballoc.c
index 9a80068756..d23cf8cb9c 100644
--- a/sys/kern/kern_slaballoc.c
+++ b/sys/kern/kern_slaballoc.c
@@ -828,7 +828,7 @@ kmalloc(unsigned long size, struct malloc_type *type, int flags)
 	 * Guarentee power-of-2 alignment for power-of-2-sized chunks.
 	 * Otherwise just 8-byte align the data.
 	 */
-	if ((size | (size - 1)) + 1 == (size << 1))
+	if (powerof2(size))
 	    off = (off + size - 1) & ~(size - 1);
 	else
 	    off = (off + align - 1) & ~(align - 1);
-- 
2.41.0