linux-kernel - Re: [PATCH V9 00/10] arm64/perf: Enable branch stack sampling

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Message-ID: <20230411130326.GA22736@willie-the-truck>
Date:   Tue, 11 Apr 2023 14:03:29 +0100
From:   Will Deacon <will@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, mark.rutland@....com,
        Mark Brown <broonie@...nel.org>,
        James Clark <james.clark@....com>,
        Rob Herring <robh@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V9 00/10] arm64/perf: Enable branch stack sampling

Hi Anshuman

On Wed, Mar 15, 2023 at 10:44:34AM +0530, Anshuman Khandual wrote:
> This series enables perf branch stack sampling support on arm64 platform
> via a new arch feature called Branch Record Buffer Extension (BRBE). All
> relevant register definitions could be accessed here.
> 
> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers
> 
> This series applies on 6.3-rc1 after applying the following patch from Mark
> which allows enums in SysregFields blocks in sysreg tools.
> 
> https://lore.kernel.org/all/20230306114836.2575432-1-mark.rutland@arm.com/

As mentioned by Mark at:

https://lore.kernel.org/r/ZB2sGrsbr58ttoWI@FVFF77S0Q05N

this conflicts with supporting PMUv3 on AArch32. Please can you rebase onto
for-next/perf, which will mean moving this driver back into drivers/perf/
now?

Thanks,

Will