linux-kernel - Re: [PATCH v2 3/9] perf build: Test correct path of perf in build-test

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Date:	Fri, 15 Jan 2016 10:22:11 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	<jolsa@...hat.com>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>, <lizefan@...wei.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v2 3/9] perf build: Test correct path of perf in build-test



On 2016/1/14 22:58, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jan 14, 2016 at 11:50:21AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Jan 14, 2016 at 01:13:57PM +0000, Wang Nan escreveu:
>>> If an 'O' is passed to 'make build-test', many 'test -x' and 'test -f'
>>> will fail because perf resides in a different directory. Fix this by
>>> computing PERF_OUT according to 'O' and test correct output files.
>>> For make_kernelsrc and make_kernelsrc_tools, set KBUILD_OUTPUT_DIR
>>> instead because the path is different from others ($(O)/perf vs
>>>   $(O)/tools/perf).
>> So, before this patch:
> Also, while trying to get this to work, I found these places lacking the
> O= prefixing, right?
>
>
> diff --git a/tools/perf/tests/make b/tools/perf/tests/make
> index e74c86b00c31..67842900482e 100644
> --- a/tools/perf/tests/make
> +++ b/tools/perf/tests/make
> @@ -59,7 +59,7 @@ has = $(shell which $1 2>/dev/null)
>   
>   # standard single make variable specified
>   make_clean_all      := clean all
> -make_python_perf_so := python/perf.so
> +make_python_perf_so := $(PERF_O)/python/perf.so
>   make_debug          := DEBUG=1
>   make_no_libperl     := NO_LIBPERL=1
>   make_no_libpython   := NO_LIBPYTHON=1
> @@ -82,9 +82,9 @@ make_tags           := tags
>   make_cscope         := cscope
>   make_help           := help
>   make_doc            := doc
> -make_perf_o           := perf.o
> -make_util_map_o       := util/map.o
> -make_util_pmu_bison_o := util/pmu-bison.o
> +make_perf_o           := $(PERF_O)/perf.o
> +make_util_map_o       := $(PERF_O)/util/map.o
> +make_util_pmu_bison_o := $(PERF_O)/util/pmu-bison.o
>   make_install        := install
>   make_install_bin    := install-bin
>   make_install_doc    := install-doc

Rechecked. As a make target we don't need this prefix:


Don't allow writing at every directories:

$ find -type d -exec  chmod 555 {} \;
$ touch ddd
touch: cannot touch ‘ddd’: Permission denied
$ make -C perf python/perf.so
make: Entering directory `/home/wangnan/kernel-hydrogen/tools/perf'
   BUILD:   Doing 'make -j24' parallel build
/bin/sh: .config-detected: Permission denied
...
config/Makefile:261: *** No gnu/libc-version.h found, please install 
glibc-dev[el].  Stop.
make: *** [python/perf.so] Error 2
make: Leaving directory `/home/wangnan/kernel-hydrogen/tools/perf'

Then use python/perf.so as make target:

$ make -C perf python/perf.so O=/tmp/xxxxx
make: Entering directory `/home/w00229757/kernel-hydrogen/tools/perf'
   BUILD:   Doing 'make -j24' parallel build

Auto-detecting system features:
...                         dwarf: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ OFF ]
...                      libaudit: [ OFF ]
...                        libbfd: [ OFF ]
...                        libelf: [ on  ]
...                       libnuma: [ OFF ]
...        numa_num_possible_cpus: [ OFF ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ OFF ]
...                     libunwind: [ OFF ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]

...
   LD       /tmp/xxxxx/fd/libapi-in.o
   GEN      /tmp/xxxxx/libtraceevent-dynamic-list
   LD       /tmp/xxxxx/fs/libapi-in.o
   LD       /tmp/xxxxx/libapi-in.o
   AR       /tmp/xxxxx/libapi.a
   LD       /tmp/xxxxx/libtraceevent-in.o
   LINK     /tmp/xxxxx/libtraceevent.a
   GEN      /tmp/xxxxx/python/perf.so
make: Leaving directory `/home/wangnan/kernel-hydrogen/tools/perf'

Adding the prefix also works it.