linux-kernel - Re: [RFC][PATCH 2/3] x86_64: Allow breakpoints to emulate call functions

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Message-ID: <20190507155817.2d08d0eb@gandalf.local.home>
Date:   Tue, 7 May 2019 15:58:17 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.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>,
        Jiri Kosina <jikos@...nel.org>,
        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>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, stable <stable@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [RFC][PATCH 2/3] x86_64: Allow breakpoints to emulate call
 functions

On Tue, 7 May 2019 14:49:25 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> > New version:
> > 
> >     x86_64: Allow breakpoints to emulate call functions
> >     
> >     In order to allow breakpoints to emulate call functions, they need to push  
> 
> Sorry to keep nitpicking, but "call functions" -> "function calls" would
> sound more accurate to me (in both subject and description).

I disagree ;-)

Matters how you look at it. I look at it as emulating the "call"
function, not a function call. Like emulating an "addl" function, or a
"jmp" function.

See?

To remove the ambiguity, I could replace "function" with "instruction".

> 
> Otherwise it looks good.

Thanks!

-- Steve