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

On Fri, 14 Sep 2018 13:36:49 +0930
Joel Stanley [off-list ref] wrote:

This effectively reverts 7563dc645853 ("powerpc: Work around gcc's
-fno-omit-frame-pointer bug"), a workaround for a bug in GCC 4.1.3 when
building 2.6.26 kernel.

The flag is not supported by clang, but reading the history of the
bug[1] suggests it is no longer required by supported GCC versions, with
GCC 4.6 now being the minimum.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=11414
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
Last time this was proposed there was an issue reported:

 https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-September/121214.html

If some machines still have an issue, we could instead wrap this in a
flag check.

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.

Thanks,
Nick