linux-kernel - Re: [PATCH v4 11/11] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write

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Message-ID: <20210723072322.GG179035@leoy-ThinkPad-X240s>
Date:   Fri, 23 Jul 2021 15:23:22 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 11/11] perf auxtrace: Add
 compat_auxtrace_mmap__{read_head|write_tail}

On Wed, Jul 14, 2021 at 09:40:15AM +0100, Russell King (Oracle) wrote:
> On Tue, Jul 13, 2021 at 07:13:02PM +0100, Catalin Marinas wrote:
> > We could try to clarify E2.2.1 to simply state that naturally aligned
> > LDRD/STRD are single-copy atomic without any subsequent statement on the
> > translation table.
> 
> I think that clarification would be most helpful. Thanks.

Thanks for the suggestion and confirmation, Russell & Catalin.

If so, I will implement the weak functions for
compat_auxtrace_mmap__{read_head|write_tail}; and write the arm/arm64
specific functions with using LDRD/STRD instructions.

For better patches organization, I will use a separate patch set for
enabling the compat functions (in particular patches 10, 11/11) in
the next spin.

Thanks,
Leo