linux-kernel - [tip:x86/urgent] x86: fix section mismatch for i386 init code

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Message-ID: <tip-56d15a6e6e65b3a5afc1d8095717bab1a3a025be@git.kernel.org>
Date:	Mon, 27 Jul 2009 21:19:23 GMT
From:	tip-bot for Robert Richter <robert.richter@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	robert.richter@....com, tglx@...utronix.de
Subject: [tip:x86/urgent] x86: fix section mismatch for i386 init code

Commit-ID:  56d15a6e6e65b3a5afc1d8095717bab1a3a025be
Gitweb:     http://git.kernel.org/tip/56d15a6e6e65b3a5afc1d8095717bab1a3a025be
Author:     Robert Richter <robert.richter@....com>
AuthorDate: Mon, 27 Jul 2009 19:43:52 +0200
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Mon, 27 Jul 2009 13:46:47 -0700

x86: fix section mismatch for i386 init code

Startup code for i386 in arch/x86/kernel/head_32.S is using the
reference variable initial_code that is located in the .cpuinit.data
section. If CONFIG_HOTPLUG_CPU is enabled, startup code is not in an
init section and can be called later too. In this case the reference
initial_code must be kept too. This patch fixes this. See below for
the section mismatch warning.

 WARNING: vmlinux.o(.cpuinit.data+0x0): Section mismatch in reference
 from the variable initial_code to the function
 .init.text:i386_start_kernel()
 The variable __cpuinitdata initial_code references
 a function __init i386_start_kernel().
 If i386_start_kernel is only used by initial_code then
 annotate i386_start_kernel with a matching annotation.

Signed-off-by: Robert Richter <robert.richter@....com>
LKML-Reference: <1248716632-26844-1-git-send-email-robert.richter@....com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>

---
 arch/x86/kernel/head_32.S |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 8663afb..0d98a01 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -602,7 +602,11 @@ ignore_int:
 #endif
 	iret

-.section .cpuinit.data,"wa"
+#ifndef CONFIG_HOTPLUG_CPU
+	__CPUINITDATA
+#else
+	__REFDATA
+#endif
 .align 4
 ENTRY(initial_code)
 	.long i386_start_kernel
--
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