[PATCH 09/11] x86_64: x86_64 add crashdump trigger points

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Vivek Goyal <vgoyal@xxxxxxxxxx>

o Start booting into the capture kernel after an Oops if system is in a
  unrecoverable state. System will boot into the capture kernel, if one is
  pre-loaded by the user, and capture the kernel core dump.

o One of the following conditions should be true to trigger the booting of
  capture kernel.
        - panic_on_oops is set.
        - pid of current thread is 0
        - pid of current thread is 1
        - Oops happened inside interrupt context.

Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 arch/x86_64/kernel/traps.c |    5 +++++
 1 file changed, 5 insertions(+)

--- linux-2.6.16.19.orig/arch/x86_64/kernel/traps.c
+++ linux-2.6.16.19/arch/x86_64/kernel/traps.c
@@ -30,6 +30,7 @@
 #include <linux/moduleparam.h>
 #include <linux/nmi.h>
 #include <linux/kprobes.h>
+#include <linux/kexec.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -434,6 +435,8 @@ void __kprobes __die(const char * str, s
 	printk(KERN_ALERT "RIP ");
 	printk_address(regs->rip); 
 	printk(" RSP <%016lx>\n", regs->rsp); 
+	if (kexec_should_crash(current))
+		crash_kexec(regs);
 }
 
 void die(const char * str, struct pt_regs * regs, long err)
@@ -456,6 +459,8 @@ void __kprobes die_nmi(char *str, struct
 	 */
 	printk(str, safe_smp_processor_id());
 	show_registers(regs);
+	if (kexec_should_crash(current))
+		crash_kexec(regs);
 	if (panic_on_timeout || panic_on_oops)
 		panic("nmi watchdog");
 	printk("console shuts up ...\n");

--
-
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