linux-kernel - Re: [PATCH 3/3] perf: parse the .debug_frame section in case .eh

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Date:	Tue, 10 Sep 2013 21:38:49 +0200
From:	Jean Pihet <jean.pihet@...aro.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Will Deacon <will.deacon@....com>, Jiri Olsa <jolsa@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH 3/3] perf: parse the .debug_frame section in case
 .eh_frame is not present

On 10 September 2013 21:14, David Ahern <dsahern@...il.com> wrote:
> On 9/9/13 3:00 AM, Jean Pihet wrote:
>>
>> diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
>> index 7014373..54532b8 100644
>> --- a/tools/perf/config/Makefile
>> +++ b/tools/perf/config/Makefile
>> @@ -222,7 +222,7 @@ endif
>>
>>   FLAGS_UNWIND=$(LIBUNWIND_CFLAGS) $(CFLAGS) $(LIBUNWIND_LDFLAGS)
>> $(LDFLAGS) $(EXTLIBS) $(LIBUNWIND_LIBS)
>>   ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND),libunwind),y)
>> -  msg := $(warning No libunwind found, disabling post unwind support.
>> Please install libunwind-dev[el] >= 0.99);
>> +  msg := $(warning No libunwind found, disabling post unwind support.
>> Please install libunwind-dev[el] >= 1.1);
>>     NO_LIBUNWIND := 1
>>   endif # Libunwind support
>>   endif # NO_LIBUNWIND
>
>
> Is the 1.1 version required for x86 too?
Yes if the dwarf unwinding feature is used. I know it is not in use on
x86 as of now but could be in the future since the dwarf info brings
more details in the trace, cf. http://lwn.net/Articles/499116/.

>
> David

Jean
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