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ramfs doesn't provide the .set_dirty_page a_op, and when the BLOCK layer is not configured in, 'set_page_dirty' makes a call via a NULL pointer. Signed-off-by: Dimitri Gorokhovik <dimitri.gorokhovik@free.fr> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>