[PATCH v2 5/5] powerpc: Remove -mno-sched-epilog

[Nick Desaulniers]

On Fri, Sep 14, 2018 at 2:56 PM Segher Boessenkool
<segher at kernel.crashing.org> wrote:
>
> On Sat, Sep 15, 2018 at 06:43:05AM +1000, Nicholas Piggin wrote:
> > On Fri, 14 Sep 2018 11:03:38 -0700
> > Nick Desaulniers <ndesaulniers at google.com> wrote:
> >
> > > On Thu, Sep 13, 2018 at 9:07 PM Joel Stanley <joel at jms.id.au> wrote:
> > > > Last time this was proposed there was an issue reported:
> > > >
> > > >  https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-September/121214.html
> > >
> > > Heh, did PASemi sell boxes? Interesting, I'll have to read up on my history.
> > >
> > > On Thu, Sep 13, 2018 at 10:06 PM Nicholas Piggin <npiggin at gmail.com> wrote:
> > > > I don't think we can remove it completely because up to at least 4.6
> > > > maybe 4.8 has problems.
> > > >
> > > > I have a few patches lying around I started looking at this... I'll
> > > > send them.
> > >
> > > Yeah, it's too bad the link above doesn't mention gcc version.
> > >
> > > The gcc bugreport mentions fixing the bug in
> > > 7563dc64585324f443f5ac107eb6d89ee813a2d2, not sure how to check what
> > > release version of gcc that is? (Do they tag releases?)
> >
> > I'm not sure, that's not in my gcc tree AFAIKS.
>
> This is a git hash in the kernel tree.
>
> > > Nick, do you have a test case or more context about this still being
> > > an issue in gcc 4.8? (maybe I should wait for your patch series?)
> >
> > Sorry I forgot to cc you. This has links to some of the sched
> > epilog bugs.
> >
> > https://marc.info/?l=linuxppc-embedded&m=153690223909654&w=2

Cool, cc me on the thread if you'd like me to add my reviewed-by tag
visibly on the thread.

>
> PR44199 was backported to 4.4 and PR52828 is fixed in 4.8.

Are those GCC versions? If so, what does that mean for the users of
the many GCC releases between 4.4 and 4.8?

-- 
Thanks,
~Nick Desaulniers