Re: [PATCH] arc: warn only once if DW2_UNWIND is disabled

[Alexey Brodkin]

Hi Vineet,

On Tue, 2016-06-28 at 10:00 +-0530, Vineet Gupta wrote:
+AD4- On Thursday 23 June 2016 01:30 PM, Alexey Brodkin wrote:
+AD4- +AD4- 
+AD4- +AD4- If CONFIG+AF8-ARC+AF8-DW2+AF8-UNWIND is disabled every time arc+AF8-unwind+AF8-core()
+AD4- +AD4- gets called following message gets printed in debug console:
+AD4- +AD4- -----------------+AD4-8---------------
+AD4- +AD4- CONFIG+AF8-ARC+AF8-DW2+AF8-UNWIND needs to be enabled
+AD4- +AD4- -----------------+AD4-8---------------
+AD4- +AD4- 
+AD4- +AD4- That message makes sense if user indeed wants to see a backtrace or
+AD4- +AD4- get nice function call-graphs in perf but what if user disabled
+AD4- +AD4- unwinder for the purpose? Why pollute his debug console?
+AD4- +AD4- 
+AD4- +AD4- So instead we'll warn user about possibly missing feature once and
+AD4- +AD4- let him decide if that was what he or she really wanted.
+AD4- +AD4- 
+AD4- +AD4- Signed-off-by: Alexey Brodkin +ADw-abrodkin+AEA-synopsys.com+AD4-
+AD4- +AD4- Cc: stable+AEA-vger.kernel.org+AKAAoABb-3.18+-+AF0-
+AD4-
+AD4- Does this really need to be stable backport ?

I think it makes perfect sense for any kernel version because
it saves debug console from being polluted with messages which
most probably have no point (Ok I disabled unwinder in kernel config,
why then spam me with proposals to enable it)?

-Alexey