From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42BnXf4N1FzDrS3 for ; Sat, 15 Sep 2018 06:43:14 +1000 (AEST) Received: by mail-pf1-x444.google.com with SMTP id p12-v6so4822935pfh.2 for ; Fri, 14 Sep 2018 13:43:13 -0700 (PDT) Date: Sat, 15 Sep 2018 06:43:05 +1000 From: Nicholas Piggin To: Nick Desaulniers Cc: joel@jms.id.au, linuxppc-dev@lists.ozlabs.org, Segher Boessenkool Subject: Re: [PATCH v2 5/5] powerpc: Remove -mno-sched-epilog Message-ID: <20180915064305.65eea265@roar.ozlabs.ibm.com> In-Reply-To: References: <20180914040649.1794-1-joel@jms.id.au> <20180914040649.1794-6-joel@jms.id.au> <20180914150629.405c12cc@roar.ozlabs.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, 14 Sep 2018 11:03:38 -0700 Nick Desaulniers wrote: > On Thu, Sep 13, 2018 at 9:07 PM Joel Stanley 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 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. > > 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 Thanks, Nick