* [PATCH] ARM: allow unwinder to unwind recursive functions
@ 2020-02-10 10:15 Russell King
0 siblings, 0 replies; only message in thread
From: Russell King @ 2020-02-10 10:15 UTC (permalink / raw)
To: linux-arm-kernel
Allow the unwinder to unwind recursive functions if the stack makes
progress, even if the PC is the same. This allows tracing through
recursive __switchdev_handle_port_attr_set() and similar.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
arch/arm/kernel/unwind.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 4574e6aea0a5..11a964fd66f4 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -444,7 +444,7 @@ int unwind_frame(struct stackframe *frame)
ctrl.vrs[PC] = ctrl.vrs[LR];
/* check for infinite loop */
- if (frame->pc == ctrl.vrs[PC])
+ if (frame->pc == ctrl.vrs[PC] && frame->sp == ctrl.vrs[SP])
return -URC_FAILURE;
frame->fp = ctrl.vrs[FP];
--
2.20.1
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