2.5.40: lkcd (6/9): sysrq changes for dump

Sysrq changes so that dumps can be generated on the fly.

diff -urN -X /home/bharata/dontdiff linux-2.5.40/drivers/char/sysrq.c linux-2.5.40+lkcd/drivers/char/sysrq.c
--- linux-2.5.40/drivers/char/sysrq.c	Tue Oct  1 12:37:35 2002
+++ linux-2.5.40+lkcd/drivers/char/sysrq.c	Thu Oct  3 07:18:35 2002
@@ -32,6 +32,7 @@
 #include <linux/buffer_head.h>		/* for fsync_bdev() */
 
 #include <linux/spinlock.h>
+#include <linux/dump.h>
 
 #include <asm/ptrace.h>
 
@@ -307,6 +308,34 @@
 	}
 }
 
+static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
+		struct tty_struct *tty) {
+	dump("sysrq", pt_regs);
+}
+static struct sysrq_key_op sysrq_crashdump_op = {
+	handler:	sysrq_handle_crashdump,
+	help_msg:	"Crash",
+	action_msg:	"Start a Crash Dump (If Configured)",
+};
+
+static void sysrq_handle_dumpregs(int key, struct pt_regs *pt_regs,
+		struct tty_struct *tty) {
+#if defined(CONFIG_X86) && defined(CONFIG_SMP)
+	extern void (*dump_trace_ptr)(struct pt_regs *);
+	printk("Show state of all cpus\n");
+	if (dump_trace_ptr) {
+		dump_trace_ptr(pt_regs);
+	} else {
+		printk("Load dump module/configure first\n");
+	}
+#endif
+}
+static struct sysrq_key_op sysrq_dumpregs_op = {
+	handler:	sysrq_handle_dumpregs,
+	help_msg:	"Dumpregisters",
+	action_msg:	"Dump CPU Registers (If Configured)"
+};
+
 static void sysrq_handle_term(int key, struct pt_regs *pt_regs,
 			      struct tty_struct *tty) 
 {
@@ -352,8 +381,8 @@
 		 it is handled specially on the spark
 		 and will never arive */
 /* b */	&sysrq_reboot_op,
-/* c */	NULL,
-/* d */	NULL,
+/* c */	&sysrq_crashdump_op,
+/* d */	&sysrq_dumpregs_op,
 /* e */	&sysrq_term_op,
 /* f */	NULL,
 /* g */	NULL,
-
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