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tools build feature: Check if eventfd() is available
commit 11c6cbe706
upstream.
A new 'perf bench epoll' will use this, and to disable it for older
systems, add a feature test for this API.
This is just a simple program that if successfully compiled, means that
the feature is present, at least at the library level, in a build that
sets the output directory to /tmp/build/perf (using O=/tmp/build/perf),
we end up with:
$ ls -la /tmp/build/perf/feature/test-eventfd*
-rwxrwxr-x. 1 acme acme 8176 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.bin
-rw-rw-r--. 1 acme acme 588 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.d
-rw-rw-r--. 1 acme acme 0 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.make.output
$ ldd /tmp/build/perf/feature/test-eventfd.bin
linux-vdso.so.1 (0x00007fff3bf3f000)
libc.so.6 => /lib64/libc.so.6 (0x00007fa984061000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa984417000)
$ grep eventfd -A 2 -B 2 /tmp/build/perf/FEATURE-DUMP
feature-dwarf=1
feature-dwarf_getlocations=1
feature-eventfd=1
feature-fortify-source=1
feature-sync-compare-and-swap=1
$
The main thing here is that in the end we'll have -DHAVE_EVENTFD in
CFLAGS, and then the 'perf bench' entry needing that API can be
selectively pruned.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-wkeldwob7dpx6jvtuzl8164k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
e95a27359b
commit
45c4df37e6
5 changed files with 23 additions and 1 deletions
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@ -31,6 +31,7 @@ FEATURE_TESTS_BASIC := \
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backtrace \
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dwarf \
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dwarf_getlocations \
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eventfd \
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fortify-source \
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sync-compare-and-swap \
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get_current_dir_name \
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@ -5,6 +5,7 @@ FILES= \
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test-bionic.bin \
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test-dwarf.bin \
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test-dwarf_getlocations.bin \
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test-eventfd.bin \
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test-fortify-source.bin \
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test-sync-compare-and-swap.bin \
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test-get_current_dir_name.bin \
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@ -90,6 +91,9 @@ $(OUTPUT)test-bionic.bin:
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$(OUTPUT)test-libelf.bin:
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$(BUILD) -lelf
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$(OUTPUT)test-eventfd.bin:
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$(BUILD)
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$(OUTPUT)test-get_current_dir_name.bin:
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$(BUILD)
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@ -50,6 +50,10 @@
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# include "test-dwarf_getlocations.c"
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#undef main
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#define main main_test_eventfd
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# include "test-eventfd.c"
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#undef main
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#define main main_test_libelf_getphdrnum
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# include "test-libelf-getphdrnum.c"
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#undef main
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@ -174,6 +178,7 @@ int main(int argc, char *argv[])
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main_test_glibc();
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main_test_dwarf();
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main_test_dwarf_getlocations();
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main_test_eventfd();
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main_test_libelf_getphdrnum();
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main_test_libelf_gelf_getnote();
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main_test_libelf_getshdrstrndx();
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9
tools/build/feature/test-eventfd.c
Normal file
9
tools/build/feature/test-eventfd.c
Normal file
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@ -0,0 +1,9 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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#include <sys/eventfd.h>
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int main(void)
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{
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return eventfd(0, EFD_NONBLOCK);
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}
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@ -281,11 +281,14 @@ ifndef NO_BIONIC
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endif
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endif
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ifeq ($(feature-eventfd), 1)
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CFLAGS += -DHAVE_EVENTFD
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endif
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ifeq ($(feature-get_current_dir_name), 1)
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CFLAGS += -DHAVE_GET_CURRENT_DIR_NAME
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endif
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ifdef NO_LIBELF
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NO_DWARF := 1
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NO_DEMANGLE := 1
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