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

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Message-ID: <20190507200244.mo6po3xxdg3kv2xy@treble>
Date:   Tue, 7 May 2019 15:02:44 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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, May 07, 2019 at 03:58:17PM -0400, Steven Rostedt wrote:
> 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?

I kind of see your point... but then you're overloading the meaning of
the word "function", in a context where it clearly means something else.

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

Yes, that would be much better :-)

-- 
Josh