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

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Message-ID: <20081123192243.GP12710@localhost>
Date:	Sun, 23 Nov 2008 22:22:43 +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 08:00:25PM +0100]
| 
| * Cyrill Gorcunov <gorcunov@...il.com> wrote:
| 
| > [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?
| 
| .error is perfectly fine because that way automated tests that we do 
| on -tip will catch any bugs, we really dont want to mis-annotate these 
| things. Warnings tend to only pile up and rarely get fixed - without 
| enforcement mechanism that causes people to fix them.
| 
| 	Ingo
|

Just got an error in implementation -- we have to support nested
ENTRY without problem. Will check. What a surprise :-)
 
		- Cyrill -
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