linux-kernel - Re: [PATCH] mm/slub: Switch slub_debug kernel option to early

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Message-ID: <000001423365730f-486d720c-11cd-4f7d-939b-8ff2860c60b7-000000@email.amazonses.com>
Date:	Thu, 7 Nov 2013 16:29:15 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Andreas Herrmann <andreas.herrmann@...xeda.com>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: Switch slub_debug kernel option to early_param
 to avoid boot panic

There is still something not optimal with the patch since it would disable
debuggin on the kmalloc stack. Ccheck name for NULL only if
slub_debug_slabs.


Subject: slub: Handle NULL parameter in kmem_cache_flags V2

V1->V2
 - flags need to be applied regardless if !slub_debug_slabs

kmem_cache_flags may be called with NULL parameter during early boot.
Skip the test in that case.

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2013-11-07 10:25:49.669706521 -0600
+++ linux/mm/slub.c	2013-11-07 10:27:49.130394661 -0600
@@ -1217,8 +1217,8 @@ static unsigned long kmem_cache_flags(un
 	/*
 	 * Enable debugging if selected on the kernel commandline.
 	 */
-	if (slub_debug && (!slub_debug_slabs ||
-		!strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))))
+	if (slub_debug && (!slub_debug_slabs || (name &&
+		!strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))))
 		flags |= slub_debug;

 	return flags;
--
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