linux-kernel - Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler

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Message-ID: <nycvar.YFH.7.76.1905012132100.9803@cbobk.fhfr.pm>
Date:   Wed, 1 May 2019 21:33:28 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nicolai Stange <nstange@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Juergen Gross <jgross@...e.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Joerg Roedel <jroedel@...e.de>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        live-patching@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating
 in breakpoint handler

On Wed, 1 May 2019, Steven Rostedt wrote:

> I never tested the 32 bit version of this. And we could just not
> implement it (I don't think there's live kernel patching for it
> either).

That's correct, there is no livepatching on x86_32 (and no plans for 
it). CONFIG_LIVEPATCH is not available for 32bit builds at all.

-- 
Jiri Kosina
SUSE Labs