Commit c59ed1ff authored Jun 23, 2016 by Alexey Brodkin Committed by Sasha Levin Jul 12, 2016

arc: unwind: warn only once if DW2_UNWIND is disabled



[ Upstream commit 9bd54517ee86cb164c734f72ea95aeba4804f10b ]

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.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent e4c542a8

arch/arc/kernel/stacktrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -131,7 +131,7 @@ arc_unwind_core(struct task_struct tsk, struct pt_regs regs,
		* prelogue is setup (callee regs saved and then fp set and not other
		* way around
		*/
		pr_warn("CONFIG_ARC_DW2_UNWIND needs to be enabled\n");
		pr_warn_once("CONFIG_ARC_DW2_UNWIND needs to be enabled\n");
		return 0;

		#endif