Re: [PATCH] writeback: skip balance_dirty_pages() for in-memory fs

[Minchan Kim]

On Fri, Dec 17, 2010 at 8:21 PM, Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote:
> This avoids unnecessary checks and dirty throttling on tmpfs/ramfs.
>
> It also prevents
>
> [  388.126563] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
>
> in the balance_dirty_pages tracepoint, which will call
>
>        dev_name(mapping->backing_dev_info->dev)
>
> but shmem_backing_dev_info.dev is NULL.
>
> CC: Hugh Dickins <hughd@xxxxxxxxxx>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

Is it a material for -stable?

-- 
Kind regards,
Minchan Kim
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