perf build: Add sdt feature detection

This checks whether sys/sdt.h is available or not, which is required for
DTRACE_PROBE().

We can disable this feature by passing NO_SDT=1 when building.

This flag will be used for SDT test case and further SDT events in
perftools.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146831795615.17065.17513820540591053933.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 19 insertions, 2 deletions

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index fe12bee57418..a120c6b755a9 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -62,7 +62,8 @@ FEATURE_TESTS_BASIC :=			\
         zlib                            \
         lzma                            \
         get_cpuid                       \
-        bpf
+        bpf                             \
+        sdt
 
 # 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 d6017c1abdb0..a0b29a311816 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -45,7 +45,8 @@ FILES=					\
         test-zlib.bin                   \
         test-lzma.bin                   \
         test-bpf.bin                    \
-        test-get_cpuid.bin
+        test-get_cpuid.bin              \
+        test-sdt.bin
 
 FILES := $(addprefix $(OUTPUT),$(FILES))
 
@@ -213,6 +214,9 @@ $(OUTPUT)test-get_cpuid.bin:
 $(OUTPUT)test-bpf.bin:
         $(BUILD)
 
+$(OUTPUT)test-sdt.bin:
+        $(BUILD)
+
 -include $(OUTPUT)*.d
 
 ###############################
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 843aed024a3a..699e43627397 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -145,6 +145,10 @@
 # include "test-libcrypto.c"
 #undef main
 
+#define main main_test_sdt
+# include "test-sdt.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
         main_test_libpython();
@@ -178,6 +182,7 @@ int main(int argc, char *argv[])
         main_test_get_cpuid();
         main_test_bpf();
         main_test_libcrypto();
+        main_test_sdt();
 
         return 0;
 }
diff --git a/tools/build/feature/test-sdt.c b/tools/build/feature/test-sdt.c
new file mode 100644
index 000000000000..e4531a6e80ea
--- /dev/null
+++ b/tools/build/feature/test-sdt.c
@@ -0,0 +1,7 @@
+#include <sys/sdt.h>
+
+int main(void)
+{
+        DTRACE_PROBE(provider, name);
+        return 0;
+}