linux-kernel - [patch -mm] slab: use CPU_LOCK

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Date:	Tue, 9 Jan 2007 16:06:15 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	Benjamin Gilbert <bgilbert@...cmu.edu>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Gautham shenoy <ego@...ibm.com>, Andrew Morton <akpm@...l.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: [patch -mm] slab: use CPU_LOCK_[ACQUIRE|RELEASE]

From: Heiko Carstens <heiko.carstens@...ibm.com>

Looks like this was forgotten when CPU_LOCK_[ACQUIRE|RELEASE] was
introduced.

Cc: Pekka Enberg <penberg@...helsinki.fi>
Cc: Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc: Gautham Shenoy <ego@...ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 mm/slab.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

Index: linux-2.6.20-rc3-mm1/mm/slab.c
===================================================================
--- linux-2.6.20-rc3-mm1.orig/mm/slab.c
+++ linux-2.6.20-rc3-mm1/mm/slab.c
@@ -1177,8 +1177,10 @@ static int __cpuinit cpuup_callback(stru
 	int memsize = sizeof(struct kmem_list3);
 
 	switch (action) {
-	case CPU_UP_PREPARE:
+	case CPU_LOCK_ACQUIRE:
 		mutex_lock(&cache_chain_mutex);
+		break;
+	case CPU_UP_PREPARE:
 		/*
 		 * We need to do this right in the beginning since
 		 * alloc_arraycache's are going to use this list.
@@ -1264,16 +1266,9 @@ static int __cpuinit cpuup_callback(stru
 		}
 		break;
 	case CPU_ONLINE:
-		mutex_unlock(&cache_chain_mutex);
 		start_cpu_timer(cpu);
 		break;
 #ifdef CONFIG_HOTPLUG_CPU
-	case CPU_DOWN_PREPARE:
-		mutex_lock(&cache_chain_mutex);
-		break;
-	case CPU_DOWN_FAILED:
-		mutex_unlock(&cache_chain_mutex);
-		break;
 	case CPU_DEAD:
 		/*
 		 * Even if all the cpus of a node are down, we don't free the
@@ -1344,6 +1339,8 @@ free_array_cache:
 				continue;
 			drain_freelist(cachep, l3, l3->free_objects);
 		}
+		break;
+	case CPU_LOCK_RELEASE:
 		mutex_unlock(&cache_chain_mutex);
 		break;
 	}
-
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