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>
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