linux-kernel - [PATCH] xen: make earlyprintk=xen work again

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Date:	Sat, 24 May 2008 09:19:59 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Markus Armbruster <armbru@...hat.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Gerd Hoffmann <kraxel@...hat.com>
Subject: [PATCH] xen: make earlyprintk=xen work again

For some perverse reason, if you call add_preferred_console() it prevents
setup_early_printk() from successfully enabling the boot console -
unless you make it a preferred console too...

Also, make xenboot console output distinct from normal console output,
since it gets repeated when the console handover happens, and the
duplicated output is confusing without disambiguation.

[ Applies to end of xen pvfb series ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Markus Armbruster <armbru@...hat.com>
Cc: Gerd Hoffmann <kraxel@...hat.com>
---
 arch/x86/xen/enlighten.c |    1 +
 drivers/char/hvc_xen.c   |    1 +
 2 files changed, 2 insertions(+)

===================================================================
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1270,6 +1270,7 @@ asmlinkage void __init xen_start_kernel(
 	boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
 
 	if (!is_initial_xendomain()) {
+		add_preferred_console("xenboot", 0, NULL);
 		add_preferred_console("tty", 0, NULL);
 		add_preferred_console("hvc", 0, NULL);
 	}
===================================================================
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -172,6 +172,7 @@ static void xenboot_write_console(struct
 
 	raw_console_write(string, len);
 
+	write_console(0, "(early) ", 8);
 	while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
 		linelen = pos-string+off;
 		if (off + linelen > len)


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