linux-kernel - [PATCH linux-next-20110718] Fix build error at mm/slab.c .

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Date:	Wed, 20 Jul 2011 12:19:32 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	cl@...ux.com, penberg@...nel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH linux-next-20110718] Fix build error at mm/slab.c .

ARCH_SLAB_MINALIGN might be defined as

  #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)

but gcc 3.3 cannot understand

  #if __alignof__(unsigned long long)

line.

  CC      mm/slab.o
mm/slab.c:3156:5: warning: "__alignof__" is not defined
mm/slab.c:3156:5: missing binary operator before token "("
make[1]: *** [mm/slab.o] Error 1
make: *** [mm] Error 2

Use "if (ARCH_SLAB_MINALIGN)" rather than "#if ARCH_SLAB_MINALIGN".

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
 mm/slab.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- linux-3.0-next.orig/mm/slab.c
+++ linux-3.0-next/mm/slab.c
@@ -3153,12 +3153,9 @@ static void *cache_alloc_debugcheck_afte
 	objp += obj_offset(cachep);
 	if (cachep->ctor && cachep->flags & SLAB_POISON)
 		cachep->ctor(objp);
-#if ARCH_SLAB_MINALIGN
-	if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) {
+	if (ARCH_SLAB_MINALIGN && ((u32)objp & (ARCH_SLAB_MINALIGN-1)))
 		printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n",
 		       objp, ARCH_SLAB_MINALIGN);
-	}
-#endif
 	return objp;
 }
 #else
--
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