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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>
This commit is contained in:
Russell King 2019-12-22 16:39:40 +00:00
parent bb6d3fb354
commit 8d54a27593
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/unwind.c
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@ -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];