Commit 8d54a275 authored Dec 22, 2019 by Russell King

ARM: allow unwinder to unwind recursive functions

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>

parent bb6d3fb3

arch/arm/kernel/unwind.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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];

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