linux-kernel - Re: [PATCH v3] mm: Restructure kmem_cache_create() to move debug cache integrity checks into a new function

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Message-Id: <20120815165324.f6e16eee.akpm@linux-foundation.org>
Date:	Wed, 15 Aug 2012 16:53:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	shuah.khan@...com
Cc:	"Christoph Lameter (Open Source)" <cl@...ux.com>,
	penberg@...nel.org, glommer@...allels.com, js1304@...il.com,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	shuahkhan@...il.com
Subject: Re: [PATCH v3] mm: Restructure kmem_cache_create() to move debug
 cache integrity checks into a new function

On Sun, 12 Aug 2012 10:40:18 -0600
Shuah Khan <shuah.khan@...com> wrote:

> kmem_cache_create() does cache integrity checks when CONFIG_DEBUG_VM
> is defined. These checks interspersed with the regular code path has
> lead to compile time warnings when compiled without CONFIG_DEBUG_VM
> defined. Restructuring the code to move the integrity checks in to a new
> function would eliminate the current compile warning problem and also
> will allow for future changes to the debug only code to evolve without
> introducing new warnings in the regular path. This restructuring work
> is based on the discussion in the following thread:

Your patch appears to be against some ancient old kernel, such as 3.5. 
I did this:

--- a/mm/slab_common.c~mm-slab_commonc-restructure-kmem_cache_create-to-move-debug-cache-integrity-checks-into-a-new-function-fix
+++ a/mm/slab_common.c
@@ -101,15 +101,8 @@ struct kmem_cache *kmem_cache_create(con
 
 	get_online_cpus();
 	mutex_lock(&slab_mutex);
-
-	if (kmem_cache_sanity_check(name, size))
-		goto oops;
-
-	s = __kmem_cache_create(name, size, align, flags, ctor);
-
-#ifdef CONFIG_DEBUG_VM
-oops:
-#endif
+	if (kmem_cache_sanity_check(name, size) == 0)
+		s = __kmem_cache_create(name, size, align, flags, ctor);
 	mutex_unlock(&slab_mutex);
 	put_online_cpus();
 
_

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