On Tue, Jun 25, 2019 at 02:12:22PM +0200, Andreas Gruenbacher wrote:
> > Only if we do as David suggested and make clean_and_wake_up_bit()
> > provide the RELEASE barrier.
>
> (It's clear_and_wake_up_bit, not clean_and_wake_up_bit.)
Yes, typing hard.
> > That is, currently clear_and_wake_up_bit
On Tue, 25 Jun 2019 at 12:36, Peter Zijlstra wrote:
> On Tue, Jun 25, 2019 at 11:19:35AM +0200, Andreas Gruenbacher wrote:
> > > diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
> > > index cf4c767005b1..29ea5da7 100644
> > > --- a/fs/gfs2/glops.c
> > > +++ b/fs/gfs2/glops.c
> > > @@ -227,6 +227
On Tue, Jun 25, 2019 at 11:19:35AM +0200, Andreas Gruenbacher wrote:
> > diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
> > index cf4c767005b1..29ea5da7 100644
> > --- a/fs/gfs2/glops.c
> > +++ b/fs/gfs2/glops.c
> > @@ -227,6 +227,7 @@ static void gfs2_clear_glop_pending(struct gfs2_inode
> >
Peter,
thanks for the fixes.
On Mon, 24 Jun 2019 at 18:53, Peter Zijlstra wrote:
> Hi all,
>
> I tried using wake_up_var() today and accidentally noticed that it
> didn't imply an smp_mb() and specifically requires it through
> wake_up_bit() / waitqueue_active().
>
> Now, wake_up_bit() doesn't i
(sorry for cross-posting to moderated lists btw, I've since
acquired a patch to get_maintainers.pl that wil exclude them
in the future)
On Tue, Jun 25, 2019 at 08:51:01AM +0100, David Howells wrote:
> Peter Zijlstra wrote:
>
> > I tried using wake_up_var() today and accidentally noticed that
Peter Zijlstra wrote:
> I tried using wake_up_var() today and accidentally noticed that it
> didn't imply an smp_mb() and specifically requires it through
> wake_up_bit() / waitqueue_active().
Thinking about it again, I'm not sure why you need to add the barrier when
wake_up() (which this is a w
Hi all,
I tried using wake_up_var() today and accidentally noticed that it
didn't imply an smp_mb() and specifically requires it through
wake_up_bit() / waitqueue_active().
Now, wake_up_bit() doesn't imply the barrier because it is assumed to be
used with the atomic bitops API which either implie
