configure: Make NPTL non-optional

Now all linux-user targets support building with NPTL, we can make it
mandatory. This is a good idea because:
 * NPTL is no longer new and experimental; it is completely standard
 * in practice, linux-user without NPTL is nearly useless for
   binaries built against non-ancient glibc
 * it allows us to delete the rather untested code for handling
   the non-NPTL configuration

Note that this patch leaves the CONFIG_USE_NPTL ifdefs in the
bsd-user codebase alone. This makes no change for bsd-user, since
our configure test for NPTL had a "#include <linux/futex.h>"
which means bsd-user would never have been compiled with
CONFIG_USE_NPTL defined, and it still is not.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

1 files changed, 0 insertions, 43 deletions

diff --git a/linux-user/main.c b/linux-user/main.c
index 99c3b3f5ef..5537967254 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -92,7 +92,6 @@ int cpu_get_pic_interrupt(CPUX86State *env)
 }
 #endif
 
-#if defined(CONFIG_USE_NPTL)
 /***********************************************************/
 /* Helper routines for implementing atomic operations.  */
 
@@ -207,43 +206,6 @@ void cpu_list_unlock(void)
 {
     pthread_mutex_unlock(&cpu_list_mutex);
 }
-#else /* if !CONFIG_USE_NPTL */
-/* These are no-ops because we are not threadsafe.  */
-static inline void cpu_exec_start(CPUState *cpu)
-{
-}
-
-static inline void cpu_exec_end(CPUState *cpu)
-{
-}
-
-static inline void start_exclusive(void)
-{
-}
-
-static inline void end_exclusive(void)
-{
-}
-
-void fork_start(void)
-{
-}
-
-void fork_end(int child)
-{
-    if (child) {
-        gdbserver_fork((CPUArchState *)thread_cpu->env_ptr);
-    }
-}
-
-void cpu_list_lock(void)
-{
-}
-
-void cpu_list_unlock(void)
-{
-}
-#endif
 
 
 #ifdef TARGET_I386
@@ -3156,12 +3118,7 @@ THREAD CPUState *thread_cpu;
 void task_settid(TaskState *ts)
 {
     if (ts->ts_tid == 0) {
-#ifdef CONFIG_USE_NPTL
         ts->ts_tid = (pid_t)syscall(SYS_gettid);
-#else
-        /* when no threads are used, tid becomes pid */
-        ts->ts_tid = getpid();
-#endif
     }
 }