[tip:x86/boot] x86, boot: Exclude early_serial_console.c if can' t use it.

[tip-bot for Joe Millenbach <jmillenbach@gmail.com>]

Commit-ID:  cec49df9d331feaa2fea3d24c07147c7659940d1
Gitweb:     http://git.kernel.org/tip/cec49df9d331feaa2fea3d24c07147c7659940d1
Author:     Joe Millenbach <jmillenbach@gmail.com>
AuthorDate: Thu, 19 Jul 2012 18:04:41 -0700
Committer:  H. Peter Anvin <hpa@zytor.com>
CommitDate: Sat, 21 Jul 2012 11:07:34 -0700

x86, boot: Exclude early_serial_console.c if can't use it.

Removes early_serial_console.c code if we don't have the config option that
enables it (EARLY_PRINTK). When disabling this code, make early_serial_base a
constant 0 to allow the compiler to optimize away the code that checks for
early_serial_base.

Signed-off-by: Joe Millenbach <jmillenbach@gmail.com>
Link: http://lkml.kernel.org/r/1342746282-28497-7-git-send-email-jmillenbach@gmail.com
Signed-off-by: Gokul Caushik <caushik1@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 arch/x86/boot/compressed/early_serial_console.c |    4 ++++
 arch/x86/boot/compressed/misc.h                 |   10 ++++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/x86/boot/compressed/early_serial_console.c b/arch/x86/boot/compressed/early_serial_console.c
index 261e81f..d3d003c 100644
--- a/arch/x86/boot/compressed/early_serial_console.c
+++ b/arch/x86/boot/compressed/early_serial_console.c
@@ -1,5 +1,9 @@
 #include "misc.h"
 
+#ifdef CONFIG_EARLY_PRINTK
+
 int early_serial_base;
 
 #include "../early_serial_console.c"
+
+#endif
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 618e5c8..3ffee6e 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -43,7 +43,17 @@ int cmdline_find_option(const char *option, char *buffer, int bufsize);
 int cmdline_find_option_bool(const char *option);
 
 /* early_serial_console.c */
+#ifdef CONFIG_EARLY_PRINTK
+
 extern int early_serial_base;
 void console_init(void);
 
+#else
+
+static const int early_serial_base;
+static inline void console_init(void)
+{ }
+
+#endif
+
 #endif