lost a few hours debugging an early-bootup fault within printk itself,
which manifested itself as a hard to debug early hang.
This patch makes it much easier by printing out early faults via
early_printk(), which function is alot simpler than a full printk, and
hence more likely to succeed in emergencies. (We do not recover from
early faults anyway, so there's no loss from not having these messages
in the normal printk buffer.)
Signed-off-by: Ingo Molnar <[email protected]>
----
arch/i386/kernel/head.S | 4 ++++
1 files changed, 4 insertions(+)
Index: linux/arch/i386/kernel/head.S
===================================================================
--- linux.orig/arch/i386/kernel/head.S
+++ linux/arch/i386/kernel/head.S
@@ -398,7 +398,11 @@ ignore_int:
pushl 32(%esp)
pushl 40(%esp)
pushl $int_msg
+#ifdef CONFIG_EARLY_PRINTK
+ call early_printk
+#else
call printk
+#endif
addl $(5*4),%esp
popl %ds
popl %es
-
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