linux-kernel - Re: [PATCH] tools headers: Sync x86 cpufeatures and arm64 cputype headers

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Message-ID: <20250929082733.GH7985@e132581.arm.com>
Date: Mon, 29 Sep 2025 09:27:33 +0100
From: Leo Yan <leo.yan@....com>
To: Shivank Garg <shivankg@....com>, linux-perf-users@...r.kernel.org,
	James Clark <james.clark@...aro.org>
Cc: linux-kernel@...r.kernel.org, acme@...hat.com, namhyung@...nel.org,
	yangyicong@...ilicon.com, bp@...en8.de, mingo@...nel.org,
	xin@...or.com, yosry.ahmed@...ux.dev
Subject: Re: [PATCH] tools headers: Sync x86 cpufeatures and arm64 cputype
 headers

Hi Shivank,

[ + James, perf-user ML ]

On Mon, Sep 29, 2025 at 06:16:45AM +0000, Shivank Garg wrote:
> To pick up the changes in this cset:
> 
> commit 2f8f173413f1 ("x86/vmscape: Add conditional IBPB mitigation")
> commit a508cec6e521 ("x86/vmscape: Enumerate VMSCAPE bug")
> commit c8c2647e69be ("arm64: Make  _midr_in_range_list() an exported function")
> commit e3121298c7fc ("arm64: Modify _midr_range() functions to read MIDR/REVIDR internally")
> 
> This addresses these perf build warnings:
> tools/perf$ ./check-headers.sh
> Warning: Kernel ABI header differences:
>   diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures
>   diff -u tools/arch/arm64/include/asm/cputype.h arch/arm64/include/asm/cputype.h

Please drop arm64 related syncing, otherwise, it will break perf
building.

At the meantime, James is working on refactoring cpu type definitions
for Arm64, we expect to avoid syncing cputype.h.

Thanks,
Leo