linux-kernel - Re: perf usage of arch/arm64/include/asm/cputype.h

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Message-ID: <aFBXQGeYCO2nJYNG@J2N7QTR9R3>
Date: Mon, 16 Jun 2025 18:41:20 +0100
From: Mark Rutland <mark.rutland@....com>
To: James Clark <james.clark@...aro.org>
Cc: Yicong Yang <yangyicong@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	Ali Saidi <alisaidi@...zon.com>, Leo Yan <leo.yan@...aro.org>,
	Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Jinqian Yang <yangjinqian1@...wei.com>,
	Douglas Anderson <dianders@...omium.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
	Yicong Yang <yangyicong@...ilicon.com>
Subject: Re: perf usage of arch/arm64/include/asm/cputype.h

On Mon, Jun 16, 2025 at 10:29:48AM +0100, James Clark wrote:
> I was also wondering if we could just diverge on the tools side, but in
> reality it also has to stay compatible with the definitions of all the MIDRs
> so might as well keep the whole thing identical.

I think that'd be the best option overall.

The only thing we really care about updating periodically is the set of
MIDRs, and we can factor that out to a cputype-defs.h header, and
possibly generate that too (as with sysreg-defs.h).

Mark.