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From: Leo Yan <leo.yan@linaro.org>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@linaro.org>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 07/10] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
Date: Sun, 11 Jul 2021 16:08:00 +0800	[thread overview]
Message-ID: <20210711080800.GD273828@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <86cd5d3d-2441-2f8e-28ab-54802e47c68b@intel.com>

Hi Adrian,

On Sat, Jul 10, 2021 at 03:36:53PM +0300, Adrian Hunter wrote:
> On 4/07/21 10:16 am, Leo Yan wrote:
> > Since the __sync functions have been dropped, This patch removes unused
> > build and checking for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT in perf tool.
> > 
> > Note, there have a test for SYNC_COMPARE_AND_SWAP and the test file is
> > located in build/feature/test-sync-compare-and-swap.c.  Since there
> > still has several components using the sync functions, it's deliberately
> > to not be removed.
> 
> I don't quite follow that.  If they aren't using the feature test
> macro, then why keep the feature test?

There are files are still using __sync_xxx_compare_and_swap() functions,
e.g. in the folder tools/testing/selftests/bpf.  On the other hand,
after drop __sync functions from perf, there have no any Makefile check
the feature 'feature-sync-compare-and-swap'.  So it's safe to remove the
feature test.

Sorry for confusion.  Will drop the feature test in new patch set.

Thanks,
Leo

  reply	other threads:[~2021-07-11  8:08 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-04  7:16 [PATCH v3 00/10] perf: Refine barriers for AUX ring buffer Leo Yan
2021-07-04  7:16 ` [PATCH v3 01/10] perf/ring_buffer: Add comment for barriers on " Leo Yan
2021-07-04  7:16 ` [PATCH v3 02/10] coresight: tmc-etr: Add barrier after updating " Leo Yan
2021-07-04  7:16 ` [PATCH v3 03/10] coresight: tmc-etf: Add comment for store ordering Leo Yan
2021-07-04  7:16 ` [PATCH v3 04/10] perf/x86: Add barrier after updating bts Leo Yan
2021-07-04  7:16 ` [PATCH v3 05/10] perf auxtrace: Drop legacy __sync functions Leo Yan
2021-07-10 12:34   ` Adrian Hunter
2021-07-11  7:41     ` Leo Yan
2021-07-04  7:16 ` [PATCH v3 06/10] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head() Leo Yan
2021-07-04  7:16 ` [PATCH v3 07/10] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT Leo Yan
2021-07-10 12:36   ` Adrian Hunter
2021-07-11  8:08     ` Leo Yan [this message]
2021-07-04  7:16 ` [PATCH v3 08/10] perf auxtrace: Use WRITE_ONCE() for updating aux_tail Leo Yan
2021-07-04  7:16 ` [PATCH v3 09/10] perf env: Set kernel bit mode Leo Yan
2021-07-04  7:16 ` [PATCH v3 10/10] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail} Leo Yan

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