linux-kernel - [PATCH] arch/x86/realmode: make trampoline code conditional for x86-32

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Date:	Wed, 15 Oct 2014 17:38:26 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: [PATCH] arch/x86/realmode: make trampoline code conditional for x86-32

Trampoline code is only needed for SMP and in x86-64 for wakeup
code. Make it conditional in order to minimize the kernel size.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 arch/x86/realmode/rm/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
index 7c0d7be..82b7312 100644
--- a/arch/x86/realmode/rm/Makefile
+++ b/arch/x86/realmode/rm/Makefile
@@ -20,7 +20,11 @@ wakeup-objs	+= video-vesa.o
 wakeup-objs	+= video-bios.o
 
 realmode-y			+= header.o
+ifdef CONFIG_X86_64
 realmode-y			+= trampoline_$(BITS).o
+else
+realmode-$(CONFIG_SMP)		+= trampoline_$(BITS).o
+endif
 realmode-y			+= stack.o
 realmode-y			+= reboot.o
 realmode-$(CONFIG_ACPI_SLEEP)	+= $(wakeup-objs)
-- 
2.1.0

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