[PATCH 4/5] perf test: Enforce LLVM test: add kbuild test

Wang Nan
2015-11-05T04:28:02Z

This patch adds a kbuild testcase to check whether kernel headers
can be correctly found.

For example:
# mv /lib/modules/4.3.0-rc5{,.bak}
# perf test LLVM

38: Test LLVM searching and compiling : Skip

# perf test -v LLVM
...
<stdin>:11:10: fatal error: 'uapi/linux/fs.h' file not found
#include <uapi/linux/fs.h>
^
1 error generated.
ERROR: unable to compile -
Hint: Check error message shown above.
Hint: You can also pre-compile it into .o using:
clang -target bpf -O2 -c -
with proper -I and -D options.
Failed to compile test case: 'Test kbuild searching'
test child finished with -2

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
tools/perf/tests/Build | 9 ++++++++-
tools/perf/tests/bpf-script-test-kbuild.c | 21 +++++++++++++++++++++
tools/perf/tests/llvm.c | 4 ++++
tools/perf/tests/llvm.h | 2 ++
4 files changed, 35 insertions(+), 1 deletion(-)
create mode 100644 tools/perf/tests/bpf-script-test-kbuild.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6c095b3..a47b211 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -31,7 +31,7 @@ perf-y += sample-parsing.o
perf-y += parse-no-sample-id-all.o
perf-y += kmod-path.o
perf-y += thread-map.o
-perf-y += llvm.o llvm-src-base.o
+perf-y += llvm.o llvm-src-base.o llvm-src-kbuild.o
perf-y += topology.o

$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c
@@ -41,6 +41,13 @@ $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c
$(Q)sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
$(Q)echo ';' >> $@

+$(OUTPUT)tests/llvm-src-kbuild.c: tests/bpf-script-test-kbuild.c
+ $(call rule_mkdir)
+ $(Q)echo '#include <tests/llvm.h>' > $@
+ $(Q)echo 'const char test_llvm__bpf_test_kbuild_prog[] =' >> $@
+ $(Q)sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
+ $(Q)echo ';' >> $@
+
ifeq ($(ARCH),$(filter $(ARCH),x86 arm arm64))
perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
endif
diff --git a/tools/perf/tests/bpf-script-test-kbuild.c b/tools/perf/tests/bpf-script-test-kbuild.c
new file mode 100644
index 0000000..3626924
--- /dev/null
+++ b/tools/perf/tests/bpf-script-test-kbuild.c
@@ -0,0 +1,21 @@
+/*
+ * bpf-script-test-kbuild.c
+ * Test include from kernel header
+ */
+#ifndef LINUX_VERSION_CODE
+# error Need LINUX_VERSION_CODE
+# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
+#endif
+#define SEC(NAME) __attribute__((section(NAME), used))
+
+#include <uapi/linux/fs.h>
+#include <uapi/asm/ptrace.h>
+
+SEC("func=vfs_llseek")
+int bpf_func__vfs_llseek(void *ctx)
+{
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+int _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
index 05683c5..bc4cf50 100644
--- a/tools/perf/tests/llvm.c
+++ b/tools/perf/tests/llvm.c
@@ -40,6 +40,10 @@ static struct {
.source = test_llvm__bpf_base_prog,
.desc = "Basic BPF llvm compiling test",
},
+ [LLVM_TESTCASE_KBUILD] = {
+ .source = test_llvm__bpf_test_kbuild_prog,
+ .desc = "Test kbuild searching",
+ },
};

diff --git a/tools/perf/tests/llvm.h b/tools/perf/tests/llvm.h
index bd63cee..d91d8f4 100644
--- a/tools/perf/tests/llvm.h
+++ b/tools/perf/tests/llvm.h
@@ -5,9 +5,11 @@
#include <stdbool.h> /* for bool */

extern const char test_llvm__bpf_base_prog[];
+extern const char test_llvm__bpf_test_kbuild_prog[];

enum test_llvm__testcase {
LLVM_TESTCASE_BASE,
+ LLVM_TESTCASE_KBUILD,
__LLVM_TESTCASE_MAX,
};

--
1.8.3.4