linux-kernel - Re: [PATCH] x86: include ENTRY/END in entry handlers in entry

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Date:	Sun, 23 Nov 2008 14:35:40 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Alexander van Heukelum <heukelum@...lshack.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Glauber Costa <gcosta@...hat.com>,
	Matt Mackall <mpm@...enic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH] x86: include ENTRY/END in entry handlers in entry_64.S

[Alexander van Heukelum - Sun, Nov 23, 2008 at 12:23:54PM +0100]
| On Sun, Nov 23, 2008 at 12:21:36PM +0300, Cyrill Gorcunov wrote:
| > [Alexander van Heukelum - Sun, Nov 23, 2008 at 10:08:28AM +0100]
| > | Impact: cleanup of entry_64.S
| > | 
| > | Except for the order and the place of the functions, this
| > | patch should not change the generated code.
| > | 
| > | Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>
| > | 
| > | ---
| > |  arch/x86/kernel/entry_64.S |  259 +++++++++++++++++++-------------------------
| > |  1 files changed, 109 insertions(+), 150 deletions(-)
| > |
| > 
| > Hi Alexander,
| > 
| > great! One moment is not obvious for me -- why we
| > stopped to align interrupt section to 32 bytes?
| > Did I miss anyhing?
| 
| I put a ".p2align 5" in earlier in the series which caused the
| apicinterrupts to be 32-byte aligned. But it is a hack, really,
| relying on the generated code per stub to be between 17 and 32
| bytes, on the default alignment to be 16 bytes and all stubs
| to be in the .text section.
| 
| I'm in favour of aligning all of the interrupt/exception stubs
| to 32 bytes, but it should be implemented the right way ;),
| which means that we need KPROBE_ENTRY_P5ALIGNED and so on :-/.
| 
| Greetings,
|         Alexander
|  
| > 		- Cyrill -
| 

ah. thanks for info.

		- Cyrill -
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