From: Alexey Brodkin Date: Thu, 23 Jun 2016 08:00:39 +0000 (+0300) Subject: arc: unwind: warn only once if DW2_UNWIND is disabled X-Git-Tag: v4.7-rc6~20^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9bd54517ee86cb164c734f72ea95aeba4804f10b;p=platform%2Fkernel%2Flinux-exynos.git 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. Signed-off-by: Alexey Brodkin Cc: stable@vger.kernel.org Signed-off-by: Vineet Gupta --- diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c index e0efff1..b9192a6 100644 --- a/arch/arc/kernel/stacktrace.c +++ b/arch/arc/kernel/stacktrace.c @@ -142,7 +142,7 @@ 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