linux-kernel - Re: [PATCH v9] kallsyms: Add self-test facility

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Message-ID: <20221216115314.6120beb7@gandalf.local.home>
Date:   Fri, 16 Dec 2022 11:53:14 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Andreas Schwab' <schwab@...ux-m68k.org>,
        "'Leizhen (ThunderTown)'" <thunder.leizhen@...wei.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH v9] kallsyms: Add self-test facility

On Fri, 16 Dec 2022 16:32:08 +0000
David Laight <David.Laight@...LAB.COM> wrote:

> From: Andreas Schwab
> > Sent: 16 December 2022 16:12
> > On Dez 16 2022, David Laight wrote:
> >   
> > > The other issue is a missing "memory" clobber.  
> > 
> > strcmp is a pure read-only operation.  
> 
> Still needs the memory clobber.

What memory is being modified?

I don't know m68k assembly, but I'm guessing the (%O)+ and the (%1)+ only
modifies the register being used, and no memory is being touched.

-- Steve