linux-kernel - Re: [PATCH v2 -tip] x86/percpu: Use C for arch_raw_cpu

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Message-ID: <ZSkhV/mwN9psjt/X@gmail.com>
Date:   Fri, 13 Oct 2023 12:52:07 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Uros Bizjak <ubizjak@...il.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Nadav Amit <namit@...are.com>,
        Andy Lutomirski <luto@...nel.org>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v2 -tip] x86/percpu: Use C for arch_raw_cpu_ptr()


* Josh Poimboeuf <jpoimboe@...nel.org> wrote:

> Right now my preference would be to leave the existing interface as-is,
> and then graft optional subcommands on top.  If no subcommand is
> specified then it would default to the "run" subcommand.  It's a little
> funky, but it would work well for the common case, where ~99% of the
> functionality lives.  And it doesn't break existing setups and
> backports.
> 
> For example:
> 
>   # current interface (no changes)
>   objtool --mcount --orc --retpoline --uaccess vmlinux.o
> 
>   # same, with optional explicit "run" subcommand
>   objtool run --mcount --orc --retpoline --uaccess vmlinux.o
> 
>   # new "size" subcommand
>   obtool size [options] vmlinux.o.before vmlinux.o.after

Yeah, sounds good!

Thanks,

	Ingo