From: Jason Wessel Date: Fri, 29 Oct 2010 18:14:41 +0000 (-0500) Subject: kdb: Fix early debugging crash regression X-Git-Tag: v2.6.37-rc1~36^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=578bd4dfcda63d2ef15f025f1d5d55c0e56b9660;p=platform%2Fkernel%2Flinux-3.10.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 --- diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index 9755ac0..37755d6 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