linux-kernel - [PATCH] i386, entry_32: use zeroentry for iret

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Date:	Thu, 21 May 2009 01:18:04 +0200
From:	Alexander van Heukelum <heukelum@...tmail.fm>
To:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Cc:	Jan Beulich <JBeulich@...ell.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: [PATCH] i386, entry_32: use zeroentry for iret_exc

iret_exc uses the error_code path. Use the zeroentry macro here too. This
adds some dwarf2 annotations to the object file, but the executable code
is unchanged.

impact: prepare for removing indirect calls in error_code

Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm>
---
 arch/x86/kernel/entry_32.S |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 29dcd74..407443c 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -533,10 +533,7 @@ restore_nocheck_notrace:
 irq_return:
 	INTERRUPT_RETURN
 .section .fixup,"ax"
-ENTRY(iret_exc)
-	pushl $0			# no error code
-	pushl $do_iret_error
-	jmp error_code
+zeroentry iret_exc do_iret_error
 .previous
 .section __ex_table,"a"
 	.align 4
-- 
1.6.0.4

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