[tip:perf/core] tools build: Add test for setns()

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  86bcdb5a43997bb02ba25a76482c7bfc652ba45b
Gitweb:     http://git.kernel.org/tip/86bcdb5a43997bb02ba25a76482c7bfc652ba45b
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 18 Jul 2017 17:15:29 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 18 Jul 2017 23:14:08 -0300

tools build: Add test for setns()

And provide an alternative implementation to keep perf building on older
distros as we're about to add initial support for namespaces.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-bqdwijunhjlvps1ardykhw1i@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/Makefile.feature                              | 3 ++-
 tools/build/feature/Makefile                              | 6 +++++-
 tools/build/feature/test-all.c                            | 5 +++++
 tools/build/feature/{test-sched_getcpu.c => test-setns.c} | 4 +---
 tools/perf/Makefile.config                                | 5 +++++
 tools/perf/util/Build                                     | 4 ++++
 tools/perf/util/setns.c                                   | 8 ++++++++
 tools/perf/util/util.h                                    | 4 ++++
 8 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 523911f..c71a05b 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -64,7 +64,8 @@ FEATURE_TESTS_BASIC :=                  \
         get_cpuid                       \
         bpf                             \
         sched_getcpu			\
-        sdt
+        sdt				\
+        setns
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 # of all feature tests
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index e35e4e5..ee2546d 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -49,7 +49,8 @@ FILES=                                          \
          test-sdt.bin                           \
          test-cxx.bin                           \
          test-jvmti.bin				\
-         test-sched_getcpu.bin
+         test-sched_getcpu.bin			\
+         test-setns.bin
 
 FILES := $(addprefix $(OUTPUT),$(FILES))
 
@@ -95,6 +96,9 @@ $(OUTPUT)test-glibc.bin:
 $(OUTPUT)test-sched_getcpu.bin:
 	$(BUILD)
 
+$(OUTPUT)test-setns.bin:
+	$(BUILD)
+
 DWARFLIBS := -ldw
 ifeq ($(findstring -static,${LDFLAGS}),-static)
 DWARFLIBS += -lelf -lebl -lz -llzma -lbz2
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index cc6c7c0..b5cfc64 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -153,6 +153,10 @@
 # include "test-sdt.c"
 #undef main
 
+#define main main_test_setns
+# include "test-setns.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
 	main_test_libpython();
@@ -188,6 +192,7 @@ int main(int argc, char *argv[])
 	main_test_libcrypto();
 	main_test_sched_getcpu();
 	main_test_sdt();
+	main_test_setns();
 
 	return 0;
 }
diff --git a/tools/build/feature/test-sched_getcpu.c b/tools/build/feature/test-setns.c
similarity index 53%
copy from tools/build/feature/test-sched_getcpu.c
copy to tools/build/feature/test-setns.c
index 9c6b4cb..1f714d2 100644
--- a/tools/build/feature/test-sched_getcpu.c
+++ b/tools/build/feature/test-setns.c
@@ -1,9 +1,7 @@
-#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
-#endif
 #include <sched.h>
 
 int main(void)
 {
-	return sched_getcpu();
+	return setns(0, 0);
 }
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index bdf0e87..37d203c 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -330,6 +330,11 @@ ifeq ($(feature-sched_getcpu), 1)
   CFLAGS += -DHAVE_SCHED_GETCPU_SUPPORT
 endif
 
+ifeq ($(feature-setns), 1)
+  CFLAGS += -DHAVE_SETNS_SUPPORT
+  $(call detected,CONFIG_SETNS)
+endif
+
 ifndef NO_LIBELF
   CFLAGS += -DHAVE_LIBELF_SUPPORT
   EXTLIBS += -lelf
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 79dea95..7580fe4 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -104,6 +104,10 @@ ifndef CONFIG_LIBELF
 libperf-y += symbol-minimal.o
 endif
 
+ifndef CONFIG_SETNS
+libperf-y += setns.o
+endif
+
 libperf-$(CONFIG_DWARF) += probe-finder.o
 libperf-$(CONFIG_DWARF) += dwarf-aux.o
 libperf-$(CONFIG_DWARF) += dwarf-regs.o
diff --git a/tools/perf/util/setns.c b/tools/perf/util/setns.c
new file mode 100644
index 0000000..ce8fc29
--- /dev/null
+++ b/tools/perf/util/setns.c
@@ -0,0 +1,8 @@
+#include "util.h"
+#include <unistd.h>
+#include <sys/syscall.h>
+
+int setns(int fd, int nstype)
+{
+	return syscall(__NR_setns, fd, nstype);
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 2c9e58a..1e5fe1d 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -58,4 +58,8 @@ const char *perf_tip(const char *dirpath);
 int sched_getcpu(void);
 #endif
 
+#ifndef HAVE_SETNS_SUPPORT
+int setns(int fd, int nstype);
+#endif
+
 #endif /* GIT_COMPAT_UTIL_H */