linux-kernel - Re: [RFC -tip] x86: introduce ENTRY(KPROBE)_X86 assembly helpers to catch unbalanced declaration

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Message-ID: <20081123175846.GF12710@localhost>
Date:	Sun, 23 Nov 2008 20:58:46 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC -tip] x86: introduce ENTRY(KPROBE)_X86  assembly helpers
	to catch unbalanced declaration

[Sam Ravnborg - Sun, Nov 23, 2008 at 06:51:25PM +0100]
| On Sun, Nov 23, 2008 at 07:57:11PM +0300, Cyrill Gorcunov wrote:
| > It's usefull to catch unbalanced, missed or mixed declarations of ENTRY and
| > KPROBES. These macros would help a bit (at least I hope so).
| > 
| > For example the following code would compile without problems
| > 
| >         ENTRY_X86(mcount)
| >                 retq
| >         END_X86(mcount)
| > 
| > But if you forget and mix the following form
| > 
| >         ENTRY_X86(mcount)
| >                 retq
| >         END(mcount)
| > 
| >         ENTRY_X86(ftrace_caller)
| > 
| > The assembler will issue the following message:
| > Error: ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed
| > 
| > Actually the checking is performed at every _X86 macro
| > so maybe it's good idea to put ENTRY_KPROBE_FINAL_X86
| > at the end of .S file to be sure you didn't miss anything.
| 
| Could we at least try this out in -next before we decide to make 
| this X86 only?
| I am aware that binutils can be a bit fragile but -next testing should
| make a good check on this.
| 
| 	Sam
| 

I don't have -next tree on my laptop, neither cross-compile tools but
if someone could test it -- it would be great. But I used gas macros
here -- i doubt other architectures has the same syntax. At least
PDP-11 would beat us with ';' symbol :)

		- Cyrill -
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