[PATCH 1/2] x86/boot: move early_serial_base to .data section

[Pingfan Liu <kernelfans@gmail.com>]

arch/x86/boot/compressed/head_64.S clears BSS after relocated. If early
serial is set up before clearing BSS, the early_serial_base will be reset
to 0.

Initializing early_serial_base as -1 to push it to .data section.

Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jordan Borgner <mail@jordan-borgner.de>
Cc: linux-kernel@vger.kernel.org
---
 arch/x86/boot/compressed/early_serial_console.c | 2 +-
 arch/x86/boot/early_serial_console.c            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/boot/compressed/early_serial_console.c b/arch/x86/boot/compressed/early_serial_console.c
index 261e81f..624e334 100644
--- a/arch/x86/boot/compressed/early_serial_console.c
+++ b/arch/x86/boot/compressed/early_serial_console.c
@@ -1,5 +1,5 @@
 #include "misc.h"
 
-int early_serial_base;
+int early_serial_base = -1;
 
 #include "../early_serial_console.c"
diff --git a/arch/x86/boot/early_serial_console.c b/arch/x86/boot/early_serial_console.c
index 023bf1c..d8de15a 100644
--- a/arch/x86/boot/early_serial_console.c
+++ b/arch/x86/boot/early_serial_console.c
@@ -149,6 +149,6 @@ void console_init(void)
 {
 	parse_earlyprintk();
 
-	if (!early_serial_base)
+	if (early_serial_base <= 0)
 		parse_console_uart8250();
 }
-- 
2.7.4