commit 1c37963b1a1600b9686c4a99857ddcb6028be884
author Russell King <rmk+kernel@armlinux.org.uk> Wed Apr 11 19:35:19 2018 +0100
committer Russell King <rmk+kernel@armlinux.org.uk> Sat May 19 11:35:56 2018 +0100
tree 64fc17a95c9c4f6b8345c9cb8e23c2bfd4a7602c
parent 2d7b3c64431245c95b05a441669c074da10db943

ARM: kexec: record parent context registers for non-crash CPUs

How we got to machine_crash_nonpanic_core() (iow, from an IPI, etc) is
not interesting for debugging a crash.  The more interesting context
is the parent context prior to the IPI being received.

Record the parent context register state rather than the register state
in machine_crash_nonpanic_core(), which is more relevant to the failing
condition.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/kernel/machine_kexec.c

diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index c153184..dd2eb5f 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -83,7 +83,7 @@ void machine_crash_nonpanic_core(void *unused)
 {
 	struct pt_regs regs;
 
-	crash_setup_regs(&regs, NULL);
+	crash_setup_regs(&regs, get_irq_regs());
 	printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
 	       smp_processor_id());
 	crash_save_cpu(&regs, smp_processor_id());