[tip:perf/core] tools build: Check if gettid() is available before providing helper

From: tip-bot for Arnaldo Carvalho de Melo
Date: Sat Jun 22 2019 - 02:44:21 EST

Commit-ID: 4541a8bb13a86e504416a13360c8dc64d2fd612a
Gitweb: https://git.kernel.org/tip/4541a8bb13a86e504416a13360c8dc64d2fd612a
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 13 Jun 2019 12:04:19 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 17 Jun 2019 15:57:19 -0300

tools build: Check if gettid() is available before providing helper

Laura reported that the perf build failed in fedora when we got a glibc
that provides gettid(), which I reproduced using fedora rawhide with the
glibc-devel-2.29.9000-26.fc31.x86_64 package.

Add a feature check to avoid providing a gettid() helper in such
systems.

On a fedora rawhide system with this patch applied we now get:

[root@7a5f55352234 perf]# grep gettid /tmp/build/perf/FEATURE-DUMP
feature-gettid=1
[root@7a5f55352234 perf]# cat /tmp/build/perf/feature/test-gettid.make.output
[root@7a5f55352234 perf]# ldd /tmp/build/perf/feature/test-gettid.bin
linux-vdso.so.1 (0x00007ffc6b1f6000)
libc.so.6 => /lib64/libc.so.6 (0x00007f04e0a74000)
/lib64/ld-linux-x86-64.so.2 (0x00007f04e0c47000)
[root@7a5f55352234 perf]# nm /tmp/build/perf/feature/test-gettid.bin | grep -w gettid
U gettid@@GLIBC_2.30
[root@7a5f55352234 perf]#

While on a fedora:29 system:

[acme@quaco perf]$ grep gettid /tmp/build/perf/FEATURE-DUMP
feature-gettid=0
[acme@quaco perf]$ cat /tmp/build/perf/feature/test-gettid.make.output
test-gettid.c: In function âmainâ:
test-gettid.c:8:9: error: implicit declaration of function âgettidâ; did you mean âgetgidâ? [-Werror=implicit-function-declaration]
return gettid();
^~~~~~
getgid
cc1: all warnings being treated as errors
[acme@quaco perf]$

Reported-by: Laura Abbott <labbott@xxxxxxxxxx>
Tested-by: Laura Abbott <labbott@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-yfy3ch53agmklwu9o7rlgf9c@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/build/Makefile.feature | 1 +
tools/build/feature/Makefile | 4 ++++
tools/build/feature/test-all.c | 5 +++++
tools/build/feature/{test-get_current_dir_name.c => test-gettid.c} | 6 +++---
tools/perf/Makefile.config | 4 ++++
tools/perf/jvmti/jvmti_agent.c | 2 ++
6 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 3b24231c58a2..50377cc2f5f9 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -36,6 +36,7 @@ FEATURE_TESTS_BASIC := \
fortify-source \
sync-compare-and-swap \
get_current_dir_name \
+ gettid \
glibc \
gtk2 \
gtk2-infobar \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 4b8244ee65ce..523ee42db0c8 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -54,6 +54,7 @@ FILES= \
test-get_cpuid.bin \
test-sdt.bin \
test-cxx.bin \
+ test-gettid.bin \
test-jvmti.bin \
test-jvmti-cmlr.bin \
test-sched_getcpu.bin \
@@ -267,6 +268,9 @@ $(OUTPUT)test-sdt.bin:
$(OUTPUT)test-cxx.bin:
$(BUILDXX) -std=gnu++11

+$(OUTPUT)test-gettid.bin:
+ $(BUILD)
+
$(OUTPUT)test-jvmti.bin:
$(BUILD)

diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index a59c53705093..3b3d5d72124a 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -38,6 +38,10 @@
# include "test-get_current_dir_name.c"
#undef main

+#define main main_test_gettid
+# include "test-gettid.c"
+#undef main
+
#define main main_test_glibc
# include "test-glibc.c"
#undef main
@@ -195,6 +199,7 @@ int main(int argc, char *argv[])
main_test_libelf();
main_test_libelf_mmap();
main_test_get_current_dir_name();
+ main_test_gettid();
main_test_glibc();
main_test_dwarf();
main_test_dwarf_getlocations();
diff --git a/tools/build/feature/test-get_current_dir_name.c b/tools/build/feature/test-gettid.c
similarity index 53%
copy from tools/build/feature/test-get_current_dir_name.c
copy to tools/build/feature/test-gettid.c
index c3c201691b4f..ef24e42d3f1b 100644
--- a/tools/build/feature/test-get_current_dir_name.c
+++ b/tools/build/feature/test-gettid.c
@@ -1,11 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019, Red Hat Inc, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
#define _GNU_SOURCE
#include <unistd.h>
-#include <stdlib.h>

int main(void)
{
- free(get_current_dir_name());
- return 0;
+ return gettid();
}
+
#undef _GNU_SOURCE
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 51dd00f65709..5f16a20cae86 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -332,6 +332,10 @@ ifeq ($(feature-get_current_dir_name), 1)
CFLAGS += -DHAVE_GET_CURRENT_DIR_NAME
endif

+ifeq ($(feature-gettid), 1)
+ CFLAGS += -DHAVE_GETTID
+endif
+
ifdef NO_LIBELF
NO_DWARF := 1
NO_DEMANGLE := 1
diff --git a/tools/perf/jvmti/jvmti_agent.c b/tools/perf/jvmti/jvmti_agent.c
index f7eb63cbbc65..88108598d6e9 100644
--- a/tools/perf/jvmti/jvmti_agent.c
+++ b/tools/perf/jvmti/jvmti_agent.c
@@ -45,10 +45,12 @@
static char jit_path[PATH_MAX];
static void *marker_addr;

+#ifndef HAVE_GETTID
static inline pid_t gettid(void)
{
return (pid_t)syscall(__NR_gettid);
}
+#endif

static int get_e_machine(struct jitheader *hdr)
{