From: Jason Wessel <jason.wessel@windriver.com>
Date: Fri, 29 Oct 2010 18:14:41 +0000 (-0500)
Subject: kdb: Fix early debugging crash regression
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=578bd4dfcda63d2ef15f025f1d5d55c0e56b9660;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

kdb: Fix early debugging crash regression

The kdb_current legally be equal to NULL in the early boot of the x86
arch.  The problem pcan be observed by booting with the kernel arguments:

    earlyprintk=vga ekgdboc=kbd kgdbwait

The kdb shell will oops on entry and recursively fault because it
cannot get past the final stage of shell initialization.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 9755ac05e446..37755d621924 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1127,7 +1127,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
 		/* special case below */
 	} else {
 		kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
-			   kdb_current, kdb_current->pid);
+			   kdb_current, kdb_current ? kdb_current->pid : 0);
 #if defined(CONFIG_SMP)
 		kdb_printf("on processor %d ", raw_smp_processor_id());
 #endif