linux-kernel - [PATCH 2/3] x86, boot: Don't compile aslr.c when !CONFIG_RANDOMIZE

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Date:	Mon, 10 Mar 2014 13:32:13 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Jan Beulich <JBeulich@...e.com>,
	Josh Triplett <josh@...htriplett.org>,
	Kees Cook <keescook@...omium.org>,
	Kyungsik Lee <kyungsik.lee@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH 2/3] x86, boot: Don't compile aslr.c when
 !CONFIG_RANDOMIZE_BASE

All the code in aslr.c gets compiled out if !CONFIG_RANDOMIZE_BASE, but
aslr.o itself still gets compiled in.  Eliminate it from the compile
entirely in that case.

This does not change the generated code at all, in either case.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 arch/x86/boot/compressed/Makefile | 4 +++-
 arch/x86/boot/compressed/aslr.c   | 3 ---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 7c50279..42e738d 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -28,7 +28,9 @@ HOST_EXTRACFLAGS += -I$(srctree)/tools/include
 
 vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
 	$(obj)/string.o $(obj)/cmdline.o $(obj)/early_serial_console.o \
-	$(obj)/piggy.o $(obj)/cpuflags.o $(obj)/aslr.o
+	$(obj)/piggy.o $(obj)/cpuflags.o
+
+vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o
 
 $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
 
diff --git a/arch/x86/boot/compressed/aslr.c b/arch/x86/boot/compressed/aslr.c
index 4dbf967..d0f8923 100644
--- a/arch/x86/boot/compressed/aslr.c
+++ b/arch/x86/boot/compressed/aslr.c
@@ -1,6 +1,5 @@
 #include "misc.h"
 
-#ifdef CONFIG_RANDOMIZE_BASE
 #include <asm/msr.h>
 #include <asm/archrandom.h>
 #include <asm/e820.h>
@@ -313,5 +312,3 @@ unsigned char *choose_kernel_location(unsigned char *input,
 out:
 	return (unsigned char *)choice;
 }
-
-#endif /* CONFIG_RANDOMIZE_BASE */
-- 
1.9.0

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