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Subject[PATCH] allow console drivers to be called early
Date
This is a simple patch to allow arches to set early_printk_ok if they've 
registered console drivers that support early operation. I've got an ia64
specific bit and an sn2 specific bit that I can post for reference if
anyone's interested, but they're pretty straightforward, so I'm just posting
this for comments. The ia64 one just adds a register_early_consoles()
function to the ia64 code that gets called early on in setup_arch. All it
does is call the init routines of console drivers that are setup to do early
printks.

Jesse
===== kernel/printk.c 1.37 vs edited =====
--- 1.37/kernel/printk.c Tue May 4 10:48:06 2004
+++ edited/kernel/printk.c Fri May 7 15:01:33 2004
@@ -54,6 +54,7 @@
EXPORT_SYMBOL(console_printk);

int oops_in_progress;
+int early_printk_ok;

/*
* console_sem protects the console_drivers list, and also
@@ -526,7 +527,7 @@
log_level_unknown = 1;
}

- if (!cpu_online(smp_processor_id()) &&
+ if (!early_printk_ok && !cpu_online(smp_processor_id()) &&
system_state != SYSTEM_RUNNING) {
/*
* Some console drivers may assume that per-cpu resources have
===== include/linux/kernel.h 1.48 vs edited =====
--- 1.48/include/linux/kernel.h Mon Apr 12 10:53:58 2004
+++ edited/include/linux/kernel.h Fri May 7 16:16:49 2004
@@ -107,6 +107,7 @@
}

extern void bust_spinlocks(int yes);
+extern int early_printk_ok; /* If set, console drivers will be called even if the system isn't up yet */
extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
extern int panic_on_oops;
extern int system_state; /* See values below */
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