Commit 51d47999 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Russell King
Browse files

ARM: 5977/1: arm: Enable backtrace printing on oops when PC is corrupted 



If PC points outside kernel text, start printing the backtrace at LR
instead.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 1d40ddd1

arch/arm/kernel/unwind.c

+3 −1
Original line number Diff line number Diff line
@@ -359,7 +359,9 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk) 
		frame.fp = regs->ARM_fp;

		frame.sp = regs->ARM_sp;

		frame.lr = regs->ARM_lr;

		frame.pc = regs->ARM_pc;

		/* PC might be corrupted, use LR in that case. */

		frame.pc = kernel_text_address(regs->ARM_pc)

			 ? regs->ARM_pc : regs->ARM_lr;

	} else if (tsk == current) {

		frame.fp = (unsigned long)__builtin_frame_address(0);

		frame.sp = current_sp;