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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 ] ```
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