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

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Message-ID: <ZSeP4vwQ9k/v63Cy@gmail.com>
Date:   Thu, 12 Oct 2023 08:19:14 +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:

> Though, another problem is that .text has a crazy amount of padding
> which makes it always the same size, due to the SRSO alias mitigation
> alignment linker magic.  We should fix that somehow.

We could emit a non-aligned end-of-text symbol (we might have it already),
and have a script or small .c program in scripts/ or tools/ that looks
at vmlinux and displays a user-friendly and accurate list of text and
data sizes in the kernel?

And since objtool is technically an 'object files tool', and it already
looks at sections & symbols, it could also grow a:

	objtool size <objfile>

command that does the sane thing ... I'd definitely start using that, instead of 'size'.

/me runs :-)

Thanks,

	Ingo