linux-kernel - [PATCH 1/4] i386: Fix modpost warning in SMP trampoline code

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Message-ID: <20070103113430.GF17546@in.ibm.com>
Date:	Wed, 3 Jan 2007 17:04:30 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	Fastboot mailing list <fastboot@...ts.osdl.org>,
	Morton Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH 1/4] i386: Fix modpost warning in SMP trampoline code



o MODPOST generates warning for i386 if kernel is compiled with 
  CONFIG_RELOCATABLE=y

WARNING: vmlinux - Section mismatch: reference to .init.text:startup_32_smp
from .data between 'trampoline_data' (at offset 0xc0519cf8) and 'boot_gdt'

o trampoline code/data can go into init section is CPU hotplug is not 
  enabled.

Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
---

 arch/i386/kernel/trampoline.S |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN arch/i386/kernel/trampoline.S~i386-fix-modpost-warning-in-smp-trampoline-code arch/i386/kernel/trampoline.S
--- linux-2.6.20-rc2-mm1-reloc/arch/i386/kernel/trampoline.S~i386-fix-modpost-warning-in-smp-trampoline-code	2007-01-03 11:56:19.000000000 +0530
+++ linux-2.6.20-rc2-mm1-reloc-root/arch/i386/kernel/trampoline.S	2007-01-03 11:56:19.000000000 +0530
@@ -38,6 +38,11 @@
 
 .data
 
+/* We can free up trampoline after bootup if cpu hotplug is not supported. */
+#ifndef CONFIG_HOTPLUG_CPU
+.section ".init.data","aw",@progbits
+#endif
+
 .code16
 
 ENTRY(trampoline_data)
_
-
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