mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
69331af79c
The console subsystem already has an idea of a boot console, using the CON_BOOT flag. The implementation has some flaws though. The major problem is that presence of a boot console makes register_console() ignore any other console devices (unless explicitly specified on the kernel command line). This patch fixes the console selection code to *not* consider a boot console a full-featured one, so the first non-boot console registering will become the default console instead. This way the unregister call for the boot console in the register_console() function actually triggers and the handover from the boot console to the real console device works smoothly. Added a printk for the handover, so you know which console device the output goes to when the boot console stops printing messages. The disable_early_printk() call is obsolete with that patch, explicitly disabling the early console isn't needed any more as it works automagically with that patch. I've walked through the tree, dropped all disable_early_printk() instances found below arch/ and tagged the consoles with CON_BOOT if needed. The code is tested on x86, sh (thanks to Paul) and mips (thanks to Ralf). Changes to last version: Rediffed against -rc3, adapted to mips cleanups by Ralf, fixed "udbg-immortal" cmd line arg on powerpc. Signed-off-by: Gerd Hoffmann <kraxel@exsuse.de> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Andi Kleen <ak@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
35 lines
833 B
C
35 lines
833 B
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2002, 2003, 06, 07 Ralf Baechle (ralf@linux-mips.org)
|
|
* Copyright (C) 2007 MIPS Technologies, Inc.
|
|
* written by Ralf Baechle (ralf@linux-mips.org)
|
|
*/
|
|
#include <linux/console.h>
|
|
#include <linux/init.h>
|
|
|
|
extern void prom_putchar(char);
|
|
|
|
static void early_console_write(struct console *con, const char *s, unsigned n)
|
|
{
|
|
while (n-- && *s) {
|
|
if (*s == '\n')
|
|
prom_putchar('\r');
|
|
prom_putchar(*s);
|
|
s++;
|
|
}
|
|
}
|
|
|
|
static struct console early_console = {
|
|
.name = "early",
|
|
.write = early_console_write,
|
|
.flags = CON_PRINTBUFFER | CON_BOOT,
|
|
.index = -1
|
|
};
|
|
|
|
void __init setup_early_printk(void)
|
|
{
|
|
register_console(&early_console);
|
|
}
|