From 0ab0d7ac2090eae30f1c0b01ae981bb7a368f598 Mon Sep 17 00:00:00 2001
From: Vasily Gorbik <gor@linux.ibm.com>
Date: Thu, 6 Jun 2019 16:58:45 +0200
Subject: [PATCH] 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: 78c98f907413 ("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>
---
arch/s390/include/asm/stacktrace.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/include/asm/stacktrace.h b/arch/s390/include/asm/stacktrace.h
index 49634bfbecdd0..0ae4bbf7779c8 100644
--- a/arch/s390/include/asm/stacktrace.h
+++ b/arch/s390/include/asm/stacktrace.h
@@ -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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