Commit 0ab0d7ac authored Jun 06, 2019 by Vasily Gorbik Committed by Heiko Carstens Jun 07, 2019

s390/unwind: correct stack switching during unwind



Adjust conditions in on_stack function. That fixes backchain unwinder
which was unable to read pt_regs at the very bottom of the stack and
hence couldn't follow stacks (e.g. from async stack to a task stack).

Fixes: 78c98f90 ("s390/unwind: introduce stack unwind API")
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

parent 962f0af8

arch/s390/include/asm/stacktrace.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -30,7 +30,7 @@ static inline bool on_stack(struct stack_info *info,
		return false;
		if (addr + len < addr)
		return false;
		return addr >= info->begin && addr + len < info->end;
		return addr >= info->begin && addr + len <= info->end;
		}

		static inline unsigned long get_stack_pointer(struct task_struct *task,

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