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Subject[PATCH] CON_BOOT

New console flag: CON_BOOT

CON_BOOT is like early printk in that it allows for output really
early on. It's better than early printk because it unregisters
automatically when a real console is initialised. So if you don't get
consoles registering in console_init, there isn't a huge delay between
the boot console unregistering and the real console starting. This is
the case on PA-RISC where we have serial ports that aren't discovered
until the PCI bus has been walked.

I think all the current early printk users could be converted to this
scheme with a minimal amount of effort.

diff -urpNX dontdiff linus-2.6/include/linux/console.h parisc-2.6/include/linux/console.h
--- linus-2.6/include/linux/console.h 2005-03-02 04:35:07.000000000 -0700
+++ parisc-2.6/include/linux/console.h 2005-03-02 04:25:54.000000000 -0700
@@ -84,6 +84,7 @@ void give_up_console(const struct consw
#define CON_PRINTBUFFER (1)
#define CON_CONSDEV (2) /* Last on the command line */
#define CON_ENABLED (4)
+#define CON_BOOT (8)

struct console
{
diff -urpNX dontdiff linus-2.6/kernel/printk.c parisc-2.6/kernel/printk.c
--- linus-2.6/kernel/printk.c 2005-03-02 04:35:10.000000000 -0700
+++ parisc-2.6/kernel/printk.c 2005-03-15 09:20:32.339891098 -0700
@@ -804,6 +804,11 @@ void register_console(struct console * c
if (!(console->flags & CON_ENABLED))
return;

+ if (console_drivers && (console_drivers->flags & CON_BOOT)) {
+ unregister_console(console_drivers);
+ console->flags &= ~CON_PRINTBUFFER;
+ }
+
/*
* Put this console in the list - keep the
* preferred driver at the head of the list.
--
"Next the statesmen will invent cheap lies, putting the blame upon
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince
himself that the war is just, and will thank God for the better sleep
he enjoys after this process of grotesque self-deception." -- Mark Twain
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