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 <kernelf...@gmail.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: Jordan Borgner <m...@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
