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

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Message-ID: <20201008212259.gdhlwdswn5pu4zos@two.firstfloor.org>
Date:   Thu, 8 Oct 2020 14:23:00 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Mark Wielaard <mark@...mp.org>
Cc:     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>,
        Andi Kleen <andi@...stfloor.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: Additional debug info to aid cacheline analysis

> Basically you simply want to remove this line in the top-level
> Makefile:
> 
> DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)

It looks like this was needed as a workaround for a gcc bug that was there
from 4.5 to 4.9.

So I guess could disable it for 5.0+ only. 

-Andi