linux-kernel - Re: [PATCH] tools/build: tweak unused value workaround

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Message-ID: <CA+rzOEmBYOBKUHYZNn3yvaFz00-tsmYKurQjTMY1-Vye_GLfEA@mail.gmail.com>
Date:   Tue, 14 Apr 2020 18:19:25 -0700
From:   George Burgess <gbiv@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/build: tweak unused value workaround

On Tue, Apr 14, 2020 at 5:00 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
> What does "disabled by default" mean?  Presumably it should now be
> enabled, but I don't think this disabling happens in the mainline
> kernel tree?

Disabled when `perf` does its configure-ish checks. Concretely,

```
~/linux/tools/perf $ make V=1 VF=1 CC=$clang -f Makefile.perf notarget \
    |& grep 'Auto-detecting\|sync-compare-and-swap'
Auto-detecting system features:
...         sync-compare-and-swap: [ OFF ]
```