On Fri 18-05-18 09:00:29, Dan Williams wrote:
On Fri, May 18, 2018 at 2:46 AM, Christoph Hellwig <hch(a)lst.de>
>> + select DEV_PAGEMAP_OPS if (ZONE_DEVICE && !FS_DAX_LIMITED)
> Btw, what was the reason again we couldn't get rid of FS_DAX_LIMITED?
The last I heard from Gerald they were still mildly interested in
keeping the dccssblk dax support going with this limited mode, and
threatened to add full page support at a later date:
dcssblk seems to work fine, I did not see any SIGBUS while "executing
in place" from dcssblk with the current upstream kernel, maybe because
we only use dcssblk with fs dax in read-only mode.
Anyway, the dcssblk change is fine with me. I will look into adding
struct pages for dcssblk memory later, to make it work again with
this change, but for now I do not know of anyone needing this in the
We definitely do have customers using "execute in place" on s390x from
dcssblk. I've got about two bug reports for it when customers were updating
from old kernels using original XIP to kernels using DAX. So we need to
keep that working.
Jan Kara <jack(a)suse.com>
SUSE Labs, CR