linux-kernel - [PATCH 22/24] ARM: enable earlyprintk=xen

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Message-ID: <1343316846-25860-22-git-send-email-stefano.stabellini@eu.citrix.com>
Date:	Thu, 26 Jul 2012 16:34:04 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<xen-devel@...ts.xensource.com>,
	<Stefano.Stabellini@...citrix.com>, <konrad.wilk@...cle.com>,
	<Ian.Campbell@...rix.com>, <tim@....org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linaro-dev@...ts.linaro.org>, <catalin.marinas@....com>,
	<arnd@...db.de>, Ian Campbell <ian.campbell@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH 22/24] ARM: enable earlyprintk=xen

From: Ian Campbell <ian.campbell@...rix.com>

Currently ARM setup_early_printk does not support alternative early
consoles and it always registers early_console only.

This patch adds support for xenboot_console.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
---
 arch/arm/kernel/early_printk.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/arm/kernel/early_printk.c b/arch/arm/kernel/early_printk.c
index 85aa2b2..eecfa21 100644
--- a/arch/arm/kernel/early_printk.c
+++ b/arch/arm/kernel/early_printk.c
@@ -11,6 +11,8 @@
 #include <linux/kernel.h>
 #include <linux/console.h>
 #include <linux/init.h>
+#include <linux/string.h>
+#include <xen/hvc-console.h>
 
 extern void printch(int);
 
@@ -50,7 +52,14 @@ asmlinkage void early_printk(const char *fmt, ...)
 
 static int __init setup_early_printk(char *buf)
 {
-	register_console(&early_console);
+	if (!buf || !strncmp(buf, "serial", 6))
+		register_console(&early_console);
+
+#ifdef CONFIG_HVC_XEN
+	if (!strncmp(buf, "xen", 3))
+		register_console(&xenboot_console);
+#endif
+
 	return 0;
 }
 
-- 
1.7.2.5

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