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

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Message-ID: <fd09a708-bc70-4a49-a6c4-860f93ff8b4a@amd.com>
Date: Tue, 30 Sep 2025 12:10:00 +0530
From: "Garg, Shivank" <shivankg@....com>
To: Leo Yan <leo.yan@....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



On 9/29/2025 2:47 PM, Garg, Shivank wrote:
> 
> 
> On 9/29/2025 1:57 PM, Leo Yan wrote:
>> 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.
> 
> Sure, I'll send V2 without arm64 sync.
> 
> Thanks,
> Shivank
>>
>> At the meantime, James is working on refactoring cpu type definitions
>> for Arm64, we expect to avoid syncing cputype.h.
>>
>> Thanks,
>> Leo
> 

tools/perf$ make
  BUILD:   Doing 'make -j128' parallel build
Warning: Kernel ABI header differences:
  diff -u tools/include/linux/cfi_types.h include/linux/cfi_types.h
  diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
  diff -u tools/include/asm-generic/bitops/__fls.h include/asm-generic/bitops/__fls.h
  diff -u tools/include/asm-generic/bitops/fls.h include/asm-generic/bitops/fls.h
  diff -u tools/include/asm-generic/bitops/fls64.h include/asm-generic/bitops/fls64.h
  diff -u tools/arch/arm64/include/asm/cputype.h arch/arm64/include/asm/cputype.h
  diff -u tools/perf/trace/beauty/include/uapi/linux/fcntl.h include/uapi/linux/fcntl.h
  diff -u tools/perf/trace/beauty/include/uapi/linux/fs.h include/uapi/linux/fs.h

There are a lot of new ABI differences today, so I think it’s best to sync after the merge window?

Thanks,
Shivank