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

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Message-ID: <20081123185726.GL12710@localhost>
Date:	Sun, 23 Nov 2008 21:57:26 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	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

[Ingo Molnar - Sun, Nov 23, 2008 at 07:54:17PM +0100]
| 
| * Cyrill Gorcunov <gorcunov@...il.com> wrote:
| 
| > [Sam Ravnborg - Sun, Nov 23, 2008 at 07:12:48PM +0100]
| > ...
| > | > 
| > | > 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 :)
| > | 
| > | If we include this in any of the 100+ trees that Stephen sucks
| > | into -next we will get it tried out.
| > | 
| > | Ingo has so and so does others so getting it into -next
| > | is rather easy. Then the automated builds will tell of if
| > | it fails on any of the toolchains used there.
| > | 
| > | 	Sam
| > | 
| > 
| > Sam, to be clear, you mean that I could put this stuff into general 
| > include/linux/linkage.h with general names as ENTRY/END and the same 
| > for KPROBE so it could be merged into -next tree for testing? If 
| > yes, that as I said there will be a lot of errors so build will 
| > stuck in a moment 'cause of unbalanced ENTRY. Not sure if it's a 
| > good idea :)
| 
| neither do i think it's a particularly good idea. Lets first prototype 
| it on x86, see how it works out in practice, and then see whether it 
| can be generic. Then it can just be lifted into the generic linkage.h 
| separately, and we can then see whether it causes new problems. 
| 
| 	Ingo
| 

So be it :) Btw I think Alexander is right -- better to use .warning
instead of .error (and without .abort) even on x86. Could you update
Ingo?

		- Cyrill -
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