linux-kernel - Re: linux-next: build failure after merge of the slab tree

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Date:	Tue, 8 Feb 2011 09:55:48 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Tso <tytso@....EDU>
Subject: Re: linux-next: build failure after merge of the slab tree

Argh. I accidentally sent an older version of the patch. This one is the
tested one.


Subject: ext4: Remove use of kmem_cache_name

Remove the use of kmem_cache_name from ext4. In order to do that we need to
strdup the name of the cache passed to kmem_cache_create.

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


---
 fs/ext4/mballoc.c |   12 ++----------
 mm/slab.c         |    7 ++++++-
 2 files changed, 8 insertions(+), 11 deletions(-)

Index: linux-2.6/fs/ext4/mballoc.c
===================================================================
--- linux-2.6.orig/fs/ext4/mballoc.c	2011-02-08 09:02:40.000000000 -0600
+++ linux-2.6/fs/ext4/mballoc.c	2011-02-08 09:11:16.000000000 -0600
@@ -2448,15 +2448,10 @@ int ext4_mb_init(struct super_block *sb,
 					bb_counters[sb->s_blocksize_bits + 2]);

 		sprintf(name, "ext4_groupinfo_%d", sb->s_blocksize_bits);
-		namep = kstrdup(name, GFP_KERNEL);
-		if (!namep) {
-			ret = -ENOMEM;
-			goto out;
-		}

 		/* Need to free the kmem_cache_name() when we
 		 * destroy the slab */
-		cachep = kmem_cache_create(namep, len, 0,
+		cachep = kmem_cache_create(name, len, 0,
 					     SLAB_RECLAIM_ACCOUNT, NULL);
 		if (!cachep) {
 			ret = -ENOMEM;
@@ -2746,11 +2741,8 @@ void ext4_exit_mballoc(void)

 	for (i = 0; i < NR_GRPINFO_CACHES; i++) {
 		struct kmem_cache *cachep = ext4_groupinfo_caches[i];
-		if (cachep) {
-			char *name = (char *)kmem_cache_name(cachep);
+		if (cachep)
 			kmem_cache_destroy(cachep);
-			kfree(name);
-		}
 	}
 	ext4_remove_debugfs_entry();
 }
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c	2011-02-08 09:06:38.000000000 -0600
+++ linux-2.6/mm/slab.c	2011-02-08 09:25:39.000000000 -0600
@@ -2005,6 +2005,7 @@ static void __kmem_cache_destroy(struct
 			kfree(l3);
 		}
 	}
+	kfree(cachep->name);
 	kmem_cache_free(&cache_cache, cachep);
 }

@@ -2412,7 +2413,11 @@ kmem_cache_create (const char *name, siz
 		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
 	}
 	cachep->ctor = ctor;
-	cachep->name = name;
+	if (slab_is_available())
+		cachep->name = kstrdup(name, GFP_KERNEL);
+	else
+		/* Will never be freed so it does not matter */
+		cachep->name = name;

 	if (setup_cpu_cache(cachep, gfp)) {
 		__kmem_cache_destroy(cachep);
--
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