linux-kernel - Re: Additional debug info to aid cacheline analysis

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Message-ID: <20201011122336.GC2666@wildebeest.org>
Date:   Sun, 11 Oct 2020 14:23:36 +0200
From:   Mark Wielaard <mark@...mp.org>
To:     Florian Weimer <fw@...eb.enyo.de>
Cc:     Andi Kleen <andi@...stfloor.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        linux-toolchains@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        "Phillips, Kim" <kim.phillips@....com>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: Additional debug info to aid cacheline analysis

On Sun, Oct 11, 2020 at 02:15:18PM +0200, Florian Weimer wrote:
> * Mark Wielaard:
> 
> > Yes, that would work. I don't know what the lowest supported GCC
> > version is, but technically it was definitely fixed in 4.10.0, 4.8.4
> > and 4.9.2. And various distros would probably have backported the
> > fix. But checking for 5.0+ would certainly give you a good version.
> >
> > How about the attached?
> 
> Would it be possible to test for the actual presence of the bug, using
> -fcompare-debug?

Yes, that was discussed in the original commit message, but it was decided
that disabling it unconditionaly was easier. See commit 2062afb4f.

Cheers,

Mark