[PATCH] Config option to disable info from decompression of the kernel

Ben Collins
2008-06-18T18:04:49Z

I submitted a similar patch some time ago, but rightfully it didn't get
accepted, as it just disabled all output from the decompress stage
(without a boot time option to enable it).

This patch just disables the information output from this stage, but not
the error output.

Signed-off-by: Ben Collins <ben.collins@canonical.com>

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 1836337..94c818f 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -20,6 +20,14 @@ config NONPROMISC_DEVMEM

If in doubt, say Y.

+config NO_BZ_CHATTER
+ bool "Disable decompress info messages"
+ default n
+ help
+ Disables just the informational output from the decompression stage
+ (e.g. bzImage) of the boot. You will still see errors. Do this if you
+ want to cleanup the bootup process.
+
config EARLY_PRINTK
bool "Early printk" if EMBEDDED
default y
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 90456ce..67cf205 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -206,7 +206,8 @@ static void free(void *where);
static void *memset(void *s, int c, unsigned n);
static void *memcpy(void *dest, const void *src, unsigned n);

-static void putstr(const char *);
+static void __putstr(int, const char *);
+#define putstr(__x) __putstr(0, __x)

#ifdef CONFIG_X86_64
#define memptr long
@@ -270,11 +271,16 @@ static void scroll(void)
vidmem[i] = ' ';
}

-static void putstr(const char *s)
+static void __putstr(int error, const char *s)
{
int x, y, pos;
char c;

+#ifdef CONFIG_NO_BZ_CHATTER
+ if (!error)
+ return;
+#endif
+
#ifdef CONFIG_X86_32
if (RM_SCREEN_INFO.orig_video_mode == 0 && lines == 0 && cols == 0)
return;
@@ -366,9 +372,9 @@ static void flush_window(void)

static void error(char *x)
{
- putstr("\n\n");
- putstr(x);
- putstr("\n\n -- System halted");
+ __putstr(1, "\n\n");
+ __putstr(1, x);
+ __putstr(1, "\n\n -- System halted");

while (1)
asm("hlt");