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Message-ID: <20190705145436.GA29396@kernel.org>
Date: Fri, 5 Jul 2019 11:54:36 -0300
From: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To: Raphael Gault <raphael.gault@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
mingo@...hat.com, peterz@...radead.org, catalin.marinas@....com,
will.deacon@....com, mark.rutland@....com
Subject: Re: [PATCH v2 1/5] perf: arm64: Add test to check userspace access
to hardware counters.
Em Fri, Jul 05, 2019 at 09:55:37AM +0100, Raphael Gault escreveu:
> This test relies on the fact that the PMU registers are accessible
> from userspace. It then uses the perf_event_mmap_page to retrieve
> the counter index and access the underlying register.
>
> This test uses sched_setaffinity(2) in order to run on all CPU and thus
> check the behaviour of the PMU of all cpus in a big.LITTLE environment.
>
> Signed-off-by: Raphael Gault <raphael.gault@....com>
> ---
> tools/perf/arch/arm64/include/arch-tests.h | 6 +
> tools/perf/arch/arm64/tests/Build | 1 +
> tools/perf/arch/arm64/tests/arch-tests.c | 4 +
> tools/perf/arch/arm64/tests/user-events.c | 255 +++++++++++++++++++++
> 4 files changed, 266 insertions(+)
> create mode 100644 tools/perf/arch/arm64/tests/user-events.c
>
> diff --git a/tools/perf/arch/arm64/include/arch-tests.h b/tools/perf/arch/arm64/include/arch-tests.h
> index 90ec4c8cb880..a9b17ae0560b 100644
> --- a/tools/perf/arch/arm64/include/arch-tests.h
> +++ b/tools/perf/arch/arm64/include/arch-tests.h
> @@ -2,11 +2,17 @@
> #ifndef ARCH_TESTS_H
> #define ARCH_TESTS_H
>
> +#define __maybe_unused __attribute__((unused))
What is wrong with using:
#include <linux/compiler.h>
?
[acme@...co perf]$ find tools/perf/ -name "*.[ch]" | xargs grep __maybe_unused | wc -l
1115
[acme@...co perf]$ grep __maybe_unused tools/include/linux/compiler.h
#ifndef __maybe_unused
# define __maybe_unused __attribute__((unused))
[acme@...co perf]$
Also please don't break strings in multiple lines just to comply with
the 80 column limit. That is ok when you have multiple lines ending with
a newline, but otherwise just makes it look ugly.
- Arnaldo
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