On Mon, Oct 30, 2017 at 02:00:28PM +0100, Jan Kara wrote:

On Fri 27-10-17 01:35:36, weiping zhang wrote:

quoted

this patch add a check for bdi_debug_root and do error handle for it.
we should make sure it was created success, otherwise when add new
block device's bdi folder(eg, 8:0) will be create a debugfs root directory.

Signed-off-by: weiping zhang <redacted>
---
 mm/backing-dev.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

These functions get called only on system boot - ENOMEM in those cases is
generally considered fatal and oopsing is acceptable result. So I don't
think this patch is needed.

OK, I drop this patch.

Thanks a ton.