arc: unwind: warn only once if DW2_UNWIND is disabled

If CONFIG_ARC_DW2_UNWIND is disabled every time arc_unwind_core() gets called following message gets printed in debug console: ----------------->8--------------- CONFIG_ARC_DW2_UNWIND needs to be enabled ----------------->8--------------- That message makes sense if user indeed wants to see a backtrace or get nice function call-graphs in perf but what if user disabled unwinder for the purpose? Why pollute his debug console? So instead we'll warn user about possibly missing feature once and let him decide if that was what he or she really wanted.

Alexey Brodkin committed 10 years ago

Commit 9bd54511 parent f52e1261 file · +1 −1Browse files

Unified · Split

arch/arc/kernel/stacktrace.c+1−1

@@ -142,7 +142,7 @@ arc_unwind_core(struct task_struct tsk, struct pt_regs regs, · 141 unmodified lines
142	* prelogue is setup (callee regs saved and then fp set and not other	142	* prelogue is setup (callee regs saved and then fp set and not other
143	* way around	143	* way around
144	*/	144	*/
145	pr_warn("CONFIG_ARC_DW2_UNWIND needs to be enabled\n");	145	pr_warn_once("CONFIG_ARC_DW2_UNWIND needs to be enabled\n");
146	return 0;	146	return 0;
147		147
148	#endif	148	#endif