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Subject[PATCH 09/11] x86_64: x86_64 add crashdump trigger points
-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Vivek Goyal <vgoyal@in.ibm.com>

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@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

---
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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