On 9/20/20 7:25 PM, Stuart Little wrote:
An update on this: I've done a bisect, with the following result. --- cut here --- e2ec5128254518cae320d5dc631b71b94160f663 is the first bad commit commit e2ec5128254518cae320d5dc631b71b94160f663 Author: Jan Kara <j...@suse.cz> Date: Sun Sep 20 08:54:42 2020 -0700 dm: Call proper helper to determine dax supportDM was calling generic_fsdax_supported() to determine whether a devicereferenced in the DM table supports DAX. However this is a helper for "leaf" device drivers so that they don't have to duplicate common generic checks. High level code should call dax_supported() helper which that calls into appropriate helper for the particular device. This problem manifested itself as kernel messages:dm-3: error: dax access failed (-95) when lvm2-testsuite run in cases where a DM device was stacked on top ofanother DM device.Fixes: 7bf7eac8d648 ("dax: Arrange for dax_supported check to span multiple devices")Cc: <sta...@vger.kernel.org> Tested-by: Adrian Huang <ahuan...@lenovo.com> Signed-off-by: Jan Kara <j...@suse.cz> Acked-by: Mike Snitzer <snit...@redhat.com> Reported-by: kernel test robot <l...@intel.com> Link: https://lore.kernel.org/r/160061715195.13131.5503173247632041975.st...@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.willi...@intel.com> drivers/dax/super.c | 4 ++++ drivers/md/dm-table.c | 10 +++++++--- include/linux/dax.h | 22 ++++++++++++++++++++-- 3 files changed, 31 insertions(+), 5 deletions(-) --- end ---
Confirm that reverting this patch, 5.9-rc6 compiles OK ... RG.
