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

[Rik van Riel]

On 12/17/2010 06:21 AM, Wu Fengguang 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>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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