It was my bad. I had those two chunks of code in a previous version
of the patch but somehow missed them in the final one.
Acked-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
On Tue, 2010-08-17 at 20:32 -0700, Hugh Dickins wrote:
> list_add() corruption messages reported from shmem_fill_super()'s recently
> introduced percpu_counter_init(): shmem_put_super() needs to remember to
> percpu_counter_destroy(). And also check error from percpu_counter_init().
>
> Reported to fix oopses in __free_pipe_info() but I cannot work that out!
>
> Reported-and-bisected-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
> Tested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> ---
>
> mm/shmem.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> --- 2.6.36-rc1/mm/shmem.c 2010-08-16 00:18:01.000000000 -0700
> +++ linux/mm/shmem.c 2010-08-17 14:42:56.000000000 -0700
> @@ -2325,7 +2325,10 @@ static int shmem_show_options(struct seq
>
> static void shmem_put_super(struct super_block *sb)
> {
> - kfree(sb->s_fs_info);
> + struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
> +
> + percpu_counter_destroy(&sbinfo->used_blocks);
> + kfree(sbinfo);
> sb->s_fs_info = NULL;
> }
>
> @@ -2367,7 +2370,8 @@ int shmem_fill_super(struct super_block
> #endif
>
> spin_lock_init(&sbinfo->stat_lock);
> - percpu_counter_init(&sbinfo->used_blocks, 0);
> + if (percpu_counter_init(&sbinfo->used_blocks, 0))
> + goto failed;
> sbinfo->free_inodes = sbinfo->max_inodes;
>
> sb->s_maxbytes = SHMEM_MAX_BYTES;
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