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

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Date:	Tue, 8 Feb 2011 18:11:04 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Tso <tytso@....edu>, sandeen@...hat.com
Subject: Re: linux-next: build failure after merge of the slab tree

On Tue, Feb 8, 2011 at 4:55 PM, Christoph Lameter <cl@...ux.com> wrote:
> 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);
>

Isn't the fs/ext4 part obsolete by Eric's "ext4: make grpinfo slab
cache names static"?
The mentionned patch is pending in ext4.git#{master, for_linus} [1].

Shouldn't this patch reduced to the mm/slab part?

- Sedat -


[1] http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git;a=commit;h=11510460562fb3fa1b061ed4d7350ccdc39a984f