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Date: Thu, 4 Jun 2026 10:34:58 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ian Rogers <irogers@google.com>
Cc: Suchit Karunakaran <suchitkarunakaran@gmail.com>, peterz@infradead.org,
	mingo@redhat.com, namhyung@kernel.org, mark.rutland@arm.com,
	alexander.shishkin@linux.intel.com, jolsa@kernel.org,
	adrian.hunter@intel.com, james.clark@linaro.org,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	bpf@vger.kernel.org
Subject: Re: [PATCH v2 2/2] perf build: compile BPF skeletons with -mcpu=v3
Message-ID: <aiF_ApG1ykL3MXdD@x1>
References: <20260530195511.71452-1-suchitkarunakaran@gmail.com>
 <CAP-5=fVZ0zOG4yEPjn2Lk2H4zteoHKjmdKdNdMeeTTMCFvZLgA@mail.gmail.com>
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On Sat, May 30, 2026 at 03:39:32PM -0700, Ian Rogers wrote:
> On Sat, May 30, 2026 at 12:55 PM Suchit Karunakaran
> <suchitkarunakaran@gmail.com> wrote:
> >
> > The lock_contention BPF program uses __sync_val_compare_and_swap()
> > to atomically update the max_time and min_time fields in
> > contention_data. This builtin lowers to the BPF_CMPXCHG instruction,
> > which is only available in BPF ISA v3. Without an explicit -mcpu flag,
> > Clang targets BPF v1/v2 by default on older toolchains (Clang < 18),
> > causing build errors when v3 instructions are emitted.
> >
> > Add -mcpu=v3 to CLANG_OPTIONS, which is used exclusively in the BPF
> > skeleton compilation rule.
> >
> > Signed-off-by: Suchit Karunakaran <suchitkarunakaran@gmail.com>
> 
> Acked-by: Ian Rogers <irogers@google.com>

Thanks, applied to perf-tools-next, for v7.2.

- Arnaldo