linux-kernel - [PATCH 3/3] perf test: mmap-thread-lookup: use gettid

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Date:   Thu, 22 Jul 2021 17:34:16 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH 3/3] perf test: mmap-thread-lookup: use gettid

This patch replaces the manual syscall to get the current thread tid,
with the libc equivalent gettid.
Since it is only available from glibc 2.30, the libc_compat.h header is
included, which provides its definition in case gettid is not available.

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/tests/mmap-thread-lookup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c
index 8d9d4cbff76d17d5..055cc850a6061798 100644
--- a/tools/perf/tests/mmap-thread-lookup.c
+++ b/tools/perf/tests/mmap-thread-lookup.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <inttypes.h>
 #include <unistd.h>
-#include <sys/syscall.h>
+#include <tools/libc_compat.h> // gettid
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <pthread.h>
@@ -45,7 +45,7 @@ static int thread_init(struct thread_data *td)
 	}
 
 	td->map = map;
-	td->tid = syscall(SYS_gettid);
+	td->tid = gettid();
 
 	pr_debug("tid = %d, map = %p\n", td->tid, map);
 	return 0;
-- 
2.31.1