[PATCH for 5.3 3/3] rseq/selftests: Fix: Namespace gettid() for compatibility with glibc 2.30

[Mathieu Desnoyers]

glibc 2.30 introduces gettid() in public headers, which clashes with
the internal static definition within rseq selftests.

Rename gettid() to rseq_gettid() to eliminate this symbol name clash.

Reported-by: Tommi T. Rantala <tommi.t.rant...@nokia.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Cc: Shuah Khan <sk...@linuxfoundation.org>
Cc: Tommi T. Rantala <tommi.t.rant...@nokia.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Peter Zijlstra (Intel) <pet...@infradead.org>
Cc: "Paul E. McKenney" <paul...@linux.ibm.com>
Cc: Boqun Feng <boqun.f...@gmail.com>
Cc: "H . Peter Anvin" <h...@zytor.com>
Cc: Paul Turner <p...@google.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: <sta...@vger.kernel.org>
---
 tools/testing/selftests/rseq/param_test.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/rseq/param_test.c 
b/tools/testing/selftests/rseq/param_test.c
index eec2663261f2..e8a657a5f48a 100644
--- a/tools/testing/selftests/rseq/param_test.c
+++ b/tools/testing/selftests/rseq/param_test.c
@@ -15,7 +15,7 @@
 #include <errno.h>
 #include <stddef.h>
 
-static inline pid_t gettid(void)
+static inline pid_t rseq_gettid(void)
 {
        return syscall(__NR_gettid);
 }
@@ -373,11 +373,12 @@ void *test_percpu_spinlock_thread(void *arg)
                rseq_percpu_unlock(&data->lock, cpu);
 #ifndef BENCHMARK
                if (i != 0 && !(i % (reps / 10)))
-                       printf_verbose("tid %d: count %lld\n", (int) gettid(), 
i);
+                       printf_verbose("tid %d: count %lld\n",
+                                      (int) rseq_gettid(), i);
 #endif
        }
        printf_verbose("tid %d: number of rseq abort: %d, signals delivered: 
%u\n",
-                      (int) gettid(), nr_abort, signals_delivered);
+                      (int) rseq_gettid(), nr_abort, signals_delivered);
        if (!opt_disable_rseq && thread_data->reg &&
            rseq_unregister_current_thread())
                abort();
@@ -454,11 +455,12 @@ void *test_percpu_inc_thread(void *arg)
                } while (rseq_unlikely(ret));
 #ifndef BENCHMARK
                if (i != 0 && !(i % (reps / 10)))
-                       printf_verbose("tid %d: count %lld\n", (int) gettid(), 
i);
+                       printf_verbose("tid %d: count %lld\n",
+                                      (int) rseq_gettid(), i);
 #endif
        }
        printf_verbose("tid %d: number of rseq abort: %d, signals delivered: 
%u\n",
-                      (int) gettid(), nr_abort, signals_delivered);
+                      (int) rseq_gettid(), nr_abort, signals_delivered);
        if (!opt_disable_rseq && thread_data->reg &&
            rseq_unregister_current_thread())
                abort();
@@ -605,7 +607,7 @@ void *test_percpu_list_thread(void *arg)
        }
 
        printf_verbose("tid %d: number of rseq abort: %d, signals delivered: 
%u\n",
-                      (int) gettid(), nr_abort, signals_delivered);
+                      (int) rseq_gettid(), nr_abort, signals_delivered);
        if (!opt_disable_rseq && rseq_unregister_current_thread())
                abort();
 
@@ -796,7 +798,7 @@ void *test_percpu_buffer_thread(void *arg)
        }
 
        printf_verbose("tid %d: number of rseq abort: %d, signals delivered: 
%u\n",
-                      (int) gettid(), nr_abort, signals_delivered);
+                      (int) rseq_gettid(), nr_abort, signals_delivered);
        if (!opt_disable_rseq && rseq_unregister_current_thread())
                abort();
 
@@ -1011,7 +1013,7 @@ void *test_percpu_memcpy_buffer_thread(void *arg)
        }
 
        printf_verbose("tid %d: number of rseq abort: %d, signals delivered: 
%u\n",
-                      (int) gettid(), nr_abort, signals_delivered);
+                      (int) rseq_gettid(), nr_abort, signals_delivered);
        if (!opt_disable_rseq && rseq_unregister_current_thread())
                abort();
 
-- 
2.17.1