linux-kernel - [PATCH RT] slab: Fix up stable merge of slab init_lock

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Date:	Thu, 18 Oct 2012 09:40:01 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>
Subject: [PATCH RT] slab: Fix up stable merge of slab init_lock_keys()

Peter,

There was a little conflict with my merge of 3.4.14 due to the backport
of this patch:

commit 947ca1856a7e60aa6d20536785e6a42dff25aa6e
Author: Michael Wang <wangyun@...ux.vnet.ibm.com>
Date:   Wed Sep 5 10:33:18 2012 +0800

    slab: fix the DEADLOCK issue on l3 alien lock

Could you just confirm that my fix is correct.

Thanks,

-- Steve


>From 741c5d3c42ad58b577d0ee602dd1f0bb52b7b92b Mon Sep 17 00:00:00 2001
From: Steven Rostedt <srostedt@...hat.com>
Date: Tue, 16 Oct 2012 17:00:19 -0400
Subject: [PATCH] slab: Fix up stable merge of slab init_lock_keys()

There was a stable fix that moved the init_lock_keys() to after
the enable_cpucache(). But -rt changed this function to
init_cachep_lock_keys(). This moves the init afterwards to
match the stable fix.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 mm/slab.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 119969a..27a194c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1763,15 +1763,12 @@ void __init kmem_cache_init_late(void)
 	/* 6) resize the head arrays to their final sizes */
 	mutex_lock(&cache_chain_mutex);
 	list_for_each_entry(cachep, &cache_chain, next) {
-		init_cachep_lock_keys(cachep);
 		if (enable_cpucache(cachep, GFP_NOWAIT))
 			BUG();
+		init_cachep_lock_keys(cachep);
 	}
 	mutex_unlock(&cache_chain_mutex);
 
-	/* Annotate slab for lockdep -- annotate the malloc caches */
-	init_lock_keys();
-
 	/* Done! */
 	g_cpucache_up = FULL;
 
-- 
1.7.10.4



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