linux-kernel - [PATCH v2 18/23] sys-rq: Add option to soft dump

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Message-ID: <20101108203322.22479.47929.stgit@crlf.mtv.corp.google.com>
Date:	Mon, 08 Nov 2010 12:33:23 -0800
From:	Mike Waychison <mikew@...gle.com>
To:	simon.kagstrom@...insight.net, davem@...emloft.net,
	nhorman@...driver.com, Matt Mackall <mpm@...enic.com>
Cc:	adurbin@...gle.com, linux-kernel@...r.kernel.org,
	chavey@...gle.com, Greg KH <greg@...ah.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	akpm@...ux-foundation.org, linux-api@...r.kernel.org
Subject: [PATCH v2 18/23] sys-rq: Add option to soft dump

It is very useful to provide some means to force the kernel logs to make it out
via the kmsg_oops implementations on the console.  Add a new option 'Y' to
sysrq to allow dumping of logs to kmsg_dumper drivers.

Signed-off-by: Mike Waychison <mikew@...gle.com>
---
 drivers/char/sysrq.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index eaa5d3e..058d3c8 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -41,6 +41,7 @@
 #include <linux/oom.h>
 #include <linux/slab.h>
 #include <linux/input.h>
+#include <linux/kmsg_dump.h>
 
 #include <asm/ptrace.h>
 #include <asm/irq_regs.h>
@@ -395,6 +396,17 @@ static struct sysrq_key_op sysrq_unrt_op = {
 	.enable_mask	= SYSRQ_ENABLE_RTNICE,
 };
 
+static void sysrq_handle_softdump(int key)
+{
+	kmsg_dump(KMSG_DUMP_SOFT, NULL);
+}
+static struct sysrq_key_op sysrq_softdump_op = {
+	.handler	= sysrq_handle_softdump,
+	.help_msg	= "soft-dump(Y)",
+	.action_msg	= "Trigger a soft dump",
+	.enable_mask	= SYSRQ_ENABLE_DUMP,
+};
+
 /* Key Operations table and lock */
 static DEFINE_SPINLOCK(sysrq_key_table_lock);
 
@@ -451,7 +463,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	/* x: May be registered on ppc/powerpc for xmon */
 	NULL,				/* x */
 	/* y: May be registered on sparc64 for global register dump */
-	NULL,				/* y */
+	&sysrq_softdump_op,		/* y */
 	&sysrq_ftrace_dump_op,		/* z */
 };
 

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