linux-kernel - [PATCH] x86: BUILD_IRQ say .text to avoid .data.percpu

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Date:	Mon, 21 Jul 2008 18:41:26 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Mike Travis <travis@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: BUILD_IRQ say .text to avoid .data.percpu

When I edit the x86_64 Makefile to -fno-unit-at-a-time, bootup panics
on 0xCCs in IRQ0x3e_interrupt(): IRQ0x20_interrupt etc. have got linked
into .data.percpu.  Perhaps there are other ways of triggering that:
specify ".text" in the BUILD_IRQ() macro for safety.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---
I've been using -fno-unit-at-a-time (to lessen inlining, for easier
debugging) for a long time, but never saw this until Mike's percpu mods
came in: I mention this so you're on the lookout, just in case other
things are more likely to go into the wrong section now.  (I did give
Mike a private headsup on this a couple of weeks ago, in case it helped
with problems he was having with percpu, but in fact it didn't help.)

 arch/x86/kernel/irqinit_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 2.6.26-git/arch/x86/kernel/irqinit_64.c	2008-07-18 11:33:31.000000000 +0100
+++ linux/arch/x86/kernel/irqinit_64.c	2008-07-18 16:07:00.000000000 +0100
@@ -43,7 +43,7 @@
 
 #define BUILD_IRQ(nr)				\
 	asmlinkage void IRQ_NAME(nr);		\
-	asm("\n.p2align\n"			\
+	asm("\n.text\n.p2align\n"		\
 	    "IRQ" #nr "_interrupt:\n\t"		\
 	    "push $~(" #nr ") ; "		\
 	    "jmp common_interrupt");
--
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