linux-kernel - Re: [PATCH] perf tools: Fix random building error

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Date:	Tue, 01 Sep 2015 09:24:14 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org,
	linux-kernel@...r.kernel.org, lizefan@...wei.com, pi3orama@....com,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] perf tools: Fix random building error

On 01/09/15 08:56, Wang Nan wrote:
> I hit following building error randomly:

Random presumably because there is a race to use/create the directory by
different make jobs (i.e. -j option).

> 
>   ...
> /bin/sh: /path/to/kernel/buildperf/util/intel-pt-decoder/inat-tables.c: No such file or directory
>   ...
>   LINK     /path/to/kernel/buildperf/plugin_mac80211.so
>   LINK     /path/to/kernel/buildperf/plugin_kmem.so
>   LINK     /path/to/kernel/buildperf/plugin_xen.so
>   LINK     /path/to/kernel/buildperf/plugin_hrtimer.so
> In file included from util/intel-pt-decoder/intel-pt-insn-decoder.c:25:0:
> util/intel-pt-decoder/inat.c:24:25: fatal error: inat-tables.c: No such file or directory
>  #include "inat-tables.c"
>                          ^
> compilation terminated.
> make[4]: *** [/path/to/kernel/buildperf/util/intel-pt-decoder/intel-pt-insn-decoder.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
>   LINK     /path/to/kernel/buildperf/plugin_function.so
> 
> This is caused by tools/perf/util/intel-pt-decoder/Build that, it tries to
> generate $(OUTPUT)util/intel-pt-decoder/inat-tables.c atomatically but
> forget to ensure the existance of $(OUTPUT)util/intel-pt-decoder directory.
> 
> This patch fixes it by adding $(call rule_mkdir) like other similar rules.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>

Looks ok to me. Jiri?

> ---
>  tools/perf/util/intel-pt-decoder/Build | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> index 240730d..2386322 100644
> --- a/tools/perf/util/intel-pt-decoder/Build
> +++ b/tools/perf/util/intel-pt-decoder/Build
> @@ -4,6 +4,7 @@ inat_tables_script = util/intel-pt-decoder/gen-insn-attr-x86.awk
>  inat_tables_maps = util/intel-pt-decoder/x86-opcode-map.txt
>  
>  $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
> +	$(call rule_mkdir)
>  	@$(call echo-cmd,gen)$(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@ || rm -f $@
>  
>  $(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> 

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