On Thu, Aug 19, 2021 at 10:14 PM Linus Torvalds
wrote:
> On Thu, Aug 19, 2021 at 12:41 PM Andreas Gruenbacher
> wrote:
> >
> > Hmm, what if GUP is made to skip VM_IO vmas without adding anything to
> > the pages array? That would match fault_in_iov_iter_writeable, which
> > is modeled after __mm_
On Thu, Aug 19, 2021 at 12:41 PM Andreas Gruenbacher
wrote:
>
> Hmm, what if GUP is made to skip VM_IO vmas without adding anything to
> the pages array? That would match fault_in_iov_iter_writeable, which
> is modeled after __mm_populate and which skips VM_IO and VM_PFNMAP
> vmas.
I don't unders
On Wed, Aug 18, 2021 at 11:49 PM Linus Torvalds
wrote:
> [ Sorry for the delay, I was on the road and this fell through the cracks ]
No harm done, I was busy enough implementing your previous suggestions.
> On Mon, Aug 16, 2021 at 12:14 PM Andreas Gruenbacher
> wrote:
> >
> > On Tue, Aug 3, 202
[ Sorry for the delay, I was on the road and this fell through the cracks ]
On Mon, Aug 16, 2021 at 12:14 PM Andreas Gruenbacher
wrote:
>
> On Tue, Aug 3, 2021 at 9:45 PM Linus Torvalds
> wrote:
> >
> > Hmm. Have you tried to figure out why that "still returns 0" happens?
>
> The call stack is:
On Tue, Aug 3, 2021 at 9:45 PM Linus Torvalds
wrote:
> On Tue, Aug 3, 2021 at 12:18 PM Andreas Gruenbacher
> wrote:
> > With this patch queue, fstest generic/208 (aio-dio-invalidate-failure.c)
> > endlessly spins in gfs2_file_direct_write. It looks as if there's a bug
> > in get_user_pages_fast
On Tue, Aug 3, 2021 at 12:18 PM Andreas Gruenbacher wrote:
>
>
> With this patch queue, fstest generic/208 (aio-dio-invalidate-failure.c)
> endlessly spins in gfs2_file_direct_write. It looks as if there's a bug
> in get_user_pages_fast when called with FOLL_FAST_ONLY:
>
> (1) The test case perf
Hi all,
here's another update on top of v5.14-rc4. There seems to be a bug in
get_user_pages_fast when called with FOLL_FAST_ONLY; please see below.
Changes:
* Change fault_in_pages_{readable,writeable} to return the number of
bytes that should be accessible instead of failing outright when
