perf tools: Provide stub for missing pthread_attr_setaffinity_np

uClibc Linuxthreads.old doesn't support the pthread_attr_setaffinity_np()
functioo:

   ----------------->8-----------------------
  CC       bench/futex-hash.o
  CC       bench/futex-wake.o
bench/futex-hash.c: In function 'bench_futex_hash':
bench/futex-hash.c:161:3: error: implicit declaration of function
'pthread_attr_setaffinity_np' [-Werror=implicit-function-declaration]
   ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t),
&cpu);
   ^
bench/futex-hash.c:161:3: error: nested extern declaration of
'pthread_attr_setaffinity_np' [-Werror=nested-externs]
   ----------------->8-----------------------

So introduce a test to check that and if not available provide a stub.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1421156604-30603-6-git-send-email-vgupta@synopsys.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/futex.h

@@ -68,4 +68,17 @@ futex_cmp_requeue(u_int32_t *uaddr, u_int32_t val, u_int32_t *uaddr2, int nr_wak
 		 val, opflags);
 }
 
+#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
+#include <pthread.h>
+static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr,
+					      size_t cpusetsize,
+					      cpu_set_t *cpuset)
+{
+	attr = attr;
+	cpusetsize = cpusetsize;
+	cpuset = cpuset;
+	return 0;
+}
+#endif
+
 #endif /* _FUTEX_H */

tools/perf/config/Makefile

@@ -198,6 +198,7 @@ CORE_FEATURE_TESTS =			\
 	libpython-version		\
 	libslang			\
 	libunwind			\
+	pthread-attr-setaffinity-np	\
 	stackprotector-all		\
 	timerfd				\
 	libdw-dwarf-unwind		\
@@ -226,6 +227,7 @@ VF_FEATURE_TESTS =			\
 	libelf-getphdrnum		\
 	libelf-mmap			\
 	libpython-version		\
+	pthread-attr-setaffinity-np	\
 	stackprotector-all		\
 	timerfd				\
 	libunwind-debug-frame		\
@@ -301,6 +303,10 @@ ifeq ($(feature-sync-compare-and-swap), 1)
   CFLAGS += -DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
 endif
 
+ifeq ($(feature-pthread-attr-setaffinity-np), 1)
+  CFLAGS += -DHAVE_PTHREAD_ATTR_SETAFFINITY_NP
+endif
+
 ifndef NO_BIONIC
   $(call feature_check,bionic)
   ifeq ($(feature-bionic), 1)

tools/perf/config/feature-checks/Makefile

@@ -25,6 +25,7 @@ FILES=					\
 	test-libslang.bin		\
 	test-libunwind.bin		\
 	test-libunwind-debug-frame.bin	\
+	test-pthread-attr-setaffinity-np.bin	\
 	test-stackprotector-all.bin	\
 	test-timerfd.bin		\
 	test-libdw-dwarf-unwind.bin	\
@@ -47,6 +48,9 @@ test-all.bin:
 test-hello.bin:
 	$(BUILD)
 
+test-pthread-attr-setaffinity-np.bin:
+	$(BUILD) -Werror -lpthread
+
 test-stackprotector-all.bin:
 	$(BUILD) -Werror -fstack-protector-all
 

tools/perf/config/feature-checks/test-all.c

@@ -97,6 +97,10 @@
 # include "test-zlib.c"
 #undef main
 
+#define main main_test_pthread_attr_setaffinity_np
+# include "test-pthread_attr_setaffinity_np.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
 	main_test_libpython();
@@ -121,6 +125,7 @@ int main(int argc, char *argv[])
 	main_test_libdw_dwarf_unwind();
 	main_test_sync_compare_and_swap(argc, argv);
 	main_test_zlib();
+	main_test_pthread_attr_setaffinity_np();
 
 	return 0;
 }

tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c

+#include <stdint.h>
+#include <pthread.h>
+
+int main(void)
+{
+	int ret = 0;
+	pthread_attr_t thread_attr;
+
+	pthread_attr_init(&thread_attr);
+	/* don't care abt exact args, just the API itself in libpthread */
+	ret = pthread_attr_setaffinity_np(&thread_attr, 0, NULL);
+
+	return ret;
+}