linux-kernel - Re: [tip: objtool/core] objtool: Function to get the name of a CPU feature

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Message-ID: <20251124122639.GBaSRO_-G9dUtVHMaY@fat_crate.local>
Date: Mon, 24 Nov 2025 13:26:39 +0100
From: Borislav Petkov <bp@...en8.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org
Subject: Re: [tip: objtool/core] objtool: Function to get the name of a CPU
 feature

On Mon, Nov 24, 2025 at 12:59:42PM +0100, Peter Zijlstra wrote:
> On Mon, Nov 24, 2025 at 10:44:01AM -0000, tip-bot2 for Alexandre Chartre wrote:
> > The following commit has been merged into the objtool/core branch of tip:
> > 
> > Commit-ID:     afff4e5820e9a0d609740a83c366f3f0335db342
> > Gitweb:        https://git.kernel.org/tip/afff4e5820e9a0d609740a83c366f3f0335db342
> > Author:        Alexandre Chartre <alexandre.chartre@...cle.com>
> > AuthorDate:    Fri, 21 Nov 2025 10:53:36 +01:00
> > Committer:     Peter Zijlstra <peterz@...radead.org>
> > CommitterDate: Mon, 24 Nov 2025 11:35:06 +01:00
> > 
> > objtool: Function to get the name of a CPU feature

Also, this commit name needs a verb.

> Boris just reported that this doesn't work on mawk, since it uses a GNU
> awk extension (3rd argument for match()).
> 
> Could you please look at writing this in strict POSIX awk?

The fail is:

awk: ../arch/x86/tools/gen-cpu-feature-names-x86.awk: line 20: syntax error at or near ,
awk: ../arch/x86/tools/gen-cpu-feature-names-x86.awk: line 23: syntax error at or near }
awk: ../arch/x86/tools/gen-cpu-feature-names-x86.awk: line 26: syntax error at or near ,
awk: ../arch/x86/tools/gen-cpu-feature-names-x86.awk: line 29: syntax error at or near }
make[5]: *** [arch/x86/Build:21: /root/kernel/linux/tools/objtool/arch/x86/lib/cpu-feature-names.c] Error 2
make[5]: *** Deleting file '/root/kernel/linux/tools/objtool/arch/x86/lib/cpu-feature-names.c'
make[4]: *** [/root/kernel/linux/tools/build/Makefile.build:142: arch/x86] Error 2
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [Makefile:104: /root/kernel/linux/tools/objtool/objtool-in.o] Error 2
make[2]: *** [Makefile:73: objtool] Error 2
make[1]: *** [/root/kernel/linux/Makefile:1449: tools/objtool] Error 2
make: *** [Makefile:248: __sub-make] Error 2

ls -al /usr/bin/awk 
lrwxrwxrwx 1 root root 21 Feb 19  2021 /usr/bin/awk -> /etc/alternatives/awk
ls -al /etc/alternatives/awk
lrwxrwxrwx 1 root root 13 Feb 19  2021 /etc/alternatives/awk -> /usr/bin/mawk

That's debian.

Thx.

-- 
Regards/Gruss,
    Boris.

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