From: Nicholas Piggin <npiggin@gmail.com>
To: Joel Stanley <joel@jms.id.au>
Cc: linuxppc-dev@lists.ozlabs.org,
Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH v2 5/5] powerpc: Remove -mno-sched-epilog
Date: Fri, 14 Sep 2018 15:06:29 +1000 [thread overview]
Message-ID: <20180914150629.405c12cc@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <20180914040649.1794-6-joel@jms.id.au>
On Fri, 14 Sep 2018 13:36:49 +0930
Joel Stanley <joel@jms.id.au> 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
next prev parent reply other threads:[~2018-09-14 5:06 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 4:06 [PATCH v2 0/5] powerpc: Clang build fixes Joel Stanley
2018-09-14 4:06 ` [PATCH v2 1/5] powerpc/Makefiles: Fix clang/llvm build Joel Stanley
2018-09-14 17:41 ` Nick Desaulniers
2018-09-20 7:04 ` Joel Stanley
2018-09-14 4:06 ` [PATCH v2 2/5] powerpc/boot: Fix crt0.S syntax for clang Joel Stanley
2018-09-14 17:47 ` Nick Desaulniers
2018-09-14 21:08 ` Segher Boessenkool
2018-09-17 20:41 ` Nick Desaulniers
2018-09-18 1:08 ` Joel Stanley
2018-09-18 10:53 ` Michael Ellerman
2018-09-14 4:06 ` [PATCH v2 3/5] powerpc/boot: Ensure _zimage_start is a weak symbol Joel Stanley
2018-09-14 17:50 ` Nick Desaulniers
2018-09-20 4:21 ` [v2,3/5] " Michael Ellerman
2018-09-14 4:06 ` [PATCH v2 4/5] powerpc: Fix duplicate const clang warning in user access code Joel Stanley
2018-09-14 17:57 ` Nick Desaulniers
2018-09-19 7:45 ` Joel Stanley
2018-09-20 4:54 ` Christophe LEROY
2018-09-20 12:35 ` Michael Ellerman
2018-09-20 4:21 ` [v2, " Michael Ellerman
2018-09-14 4:06 ` [PATCH v2 5/5] powerpc: Remove -mno-sched-epilog Joel Stanley
2018-09-14 5:06 ` Nicholas Piggin [this message]
2018-09-14 18:03 ` Nick Desaulniers
2018-09-14 20:43 ` Nicholas Piggin
2018-09-14 21:18 ` Segher Boessenkool
2018-09-14 22:20 ` Nick Desaulniers
2018-09-15 1:04 ` Segher Boessenkool
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