linux-kernel - Re: [PATCH] perf: fix building error in x86

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Date:	Wed, 7 Jan 2015 22:50:22 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lizefan@...wei.com, Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf: fix building error in x86_64 when dwarf unwind is on

On Wed, Jan 7, 2015 at 9:28 PM, Wang Nan <wangnan0@...wei.com> wrote:
> On 2015/1/7 16:39, Jiri Olsa wrote:
>> On Wed, Jan 07, 2015 at 02:40:04PM +0900, Namhyung Kim wrote:
>>> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
>>> index 67a03a825b3c..eb3e2f3e14b4 100644
>>> --- a/tools/perf/Makefile.perf
>>> +++ b/tools/perf/Makefile.perf
>>> @@ -462,10 +462,12 @@ BUILTIN_OBJS += $(OUTPUT)builtin-bench.o
>>>  # Benchmark modules
>>>  BUILTIN_OBJS += $(OUTPUT)bench/sched-messaging.o
>>>  BUILTIN_OBJS += $(OUTPUT)bench/sched-pipe.o
>>> +ifeq ($(ARCH),x86)
>>>  ifeq ($(RAW_ARCH),x86_64)
>>>  BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy-x86-64-asm.o
>>>  BUILTIN_OBJS += $(OUTPUT)bench/mem-memset-x86-64-asm.o
>>>  endif
>>> +endif
>>
>> isn't the check for x86 superfluous here? the x86_64 check is stronger
>>
>> otherwise it looks ok to me.. Wang Nan, could you please check
>> if it fixes the issue for you?
>>
>
> Sorry, although Namhyung Kim's patch solves my ARCH=x86 problem, it breaks ARM building:
>
> ...
> | bench/../../../arch/x86/lib/memcpy_64.S: Assembler messages:
> | bench/../../../arch/x86/lib/memcpy_64.S:27: Error: junk at end of line, first unrecognized character is `,'
> | bench/../../../arch/x86/lib/memcpy_64.S:29: Error: bad instruction `movq %rdi,%rax'
> | bench/../../../arch/x86/lib/memcpy_64.S:30: Error: bad instruction `movq %rdx,%rcx'
> | bench/../../../arch/x86/lib/memcpy_64.S:31: Error: bad instruction `shrq $3,%rcx'
> | bench/../../../arch/x86/lib/memcpy_64.S:32: Error: bad instruction `andl $7,%edx'
> ...

Strange.. this code is included only if ARCH=x86 in config/Makefile:

# Additional ARCH settings for x86
ifeq ($(ARCH),x86)
  ifeq (${IS_64_BIT}, 1)
    CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT
    ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
    LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
  else
    LIBUNWIND_LIBS = -lunwind -lunwind-x86
  endif
  NO_PERF_REGS := 0
endif

Did your original patch build it without a problem?


>
> It builds x86_64 bench when I corss compiling perf for arm (use ARCH=arm). This is caused by Makefile.perf:
>
> ...
> BUILTIN_OBJS += $(OUTPUT)bench/sched-pipe.o
> ifeq ($(RAW_ARCH),x86_64)
> BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy-x86-64-asm.o
> BUILTIN_OBJS += $(OUTPUT)bench/mem-memset-x86-64-asm.o
> endif
> BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy.o
> ...
>
> Which rely on RAW_ARCH, but RAW_ARCH is not a cross-compiling-friendly variable now.

That's why I added the extra ARCH check.

Thanks,
Namhyung
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