[glibc] nptl: Move internal symbol __mutex_aconf into libc

[glibc] nptl: Move internal symbol __mutex_aconf into libc

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eda0c098ed31489ce21f15d775ed96c1f6b395ad

commit eda0c098ed31489ce21f15d775ed96c1f6b395ad
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Apr 21 19:49:51 2021 +0200

    nptl: Move internal symbol __mutex_aconf into libc
    
    This is in preparation of moving the mutex code into libc.
    
    __pthread_tunables_init is now called via __pthread_early_init.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 nptl/Makefile                               |  2 +-
 nptl/Versions                               |  1 +
 nptl/nptl-init.c                            |  4 ----
 nptl/pthread_mutex_conf.c                   |  1 +
 sysdeps/nptl/pthread_early_init.h           | 33 +++++++++++++++++++++++++++++
 {nptl => sysdeps/nptl}/pthread_mutex_conf.h |  9 +++++++-
 sysdeps/pthread/pthread_mutex_conf.h        | 28 ++++++++++++++++++++++++
 7 files changed, 72 insertions(+), 6 deletions(-)

diff --git a/nptl/Makefile b/nptl/Makefile
index e4dce5f7a4..f62fdc5f4e 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -83,6 +83,7 @@ routines = \
   pthread_key_delete \
   pthread_keys \
   pthread_kill \
+  pthread_mutex_conf \
   pthread_mutex_consistent \
   pthread_once \
   pthread_rwlock_rdlock \
@@ -153,7 +154,6 @@ libpthread-routines = \
   pthread_join_common \
   pthread_kill_other_threads \
   pthread_mutex_cond_lock \
-  pthread_mutex_conf \
   pthread_mutex_destroy \
   pthread_mutex_getprioceiling \
   pthread_mutex_init \
diff --git a/nptl/Versions b/nptl/Versions
index f51110da8d..2748421a77 100644
--- a/nptl/Versions
+++ b/nptl/Versions
@@ -132,6 +132,7 @@ libc {
     __lll_lock_wait_private;
     __lll_trylock_elision;
     __lll_unlock_elision;
+    __mutex_aconf;
     __nptl_deallocate_tsd;
     __nptl_nthreads;
     __pthread_attr_copy;
diff --git a/nptl/nptl-init.c b/nptl/nptl-init.c
index fae0db383c..646c5a9623 100644
--- a/nptl/nptl-init.c
+++ b/nptl/nptl-init.c
@@ -268,10 +268,6 @@ __pthread_initialize_minimal_internal (void)
   __libc_multiple_threads_ptr =
 #endif
     __libc_pthread_init (__reclaim_stacks, ptr_pthread_functions);
-
-#if HAVE_TUNABLES
-  __pthread_tunables_init ();
-#endif
 }
 strong_alias (__pthread_initialize_minimal_internal,
 	      __pthread_initialize_minimal)
diff --git a/nptl/pthread_mutex_conf.c b/nptl/pthread_mutex_conf.c
index e6532ba1d7..e6235dea47 100644
--- a/nptl/pthread_mutex_conf.c
+++ b/nptl/pthread_mutex_conf.c
@@ -30,6 +30,7 @@ struct mutex_config __mutex_aconf =
   calling into kernel to block.  */
   .spin_count = DEFAULT_ADAPTIVE_COUNT,
 };
+libc_hidden_data_def (__mutex_aconf)
 
 static void
 TUNABLE_CALLBACK (set_mutex_spin_count) (tunable_val_t *valp)
diff --git a/sysdeps/nptl/pthread_early_init.h b/sysdeps/nptl/pthread_early_init.h
new file mode 100644
index 0000000000..2d15303dd9
--- /dev/null
+++ b/sysdeps/nptl/pthread_early_init.h
@@ -0,0 +1,33 @@
+/* pthread initialization called from __libc_early_init.  NPTL version.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _PTHREAD_EARLY_INIT_H
+#define _PTHREAD_EARLY_INIT_H 1
+
+#include <nptl/pthreadP.h>
+#include <pthread_mutex_conf.h>
+
+static inline void
+__pthread_early_init (void)
+{
+#if HAVE_TUNABLES
+  __pthread_tunables_init ();
+#endif
+}
+
+#endif  /* _PTHREAD_EARLY_INIT_H */
diff --git a/nptl/pthread_mutex_conf.h b/sysdeps/nptl/pthread_mutex_conf.h
similarity index 86%
rename from nptl/pthread_mutex_conf.h
rename to sysdeps/nptl/pthread_mutex_conf.h
index 14e135a539..9dba4bfa6d 100644
--- a/nptl/pthread_mutex_conf.h
+++ b/sysdeps/nptl/pthread_mutex_conf.h
@@ -26,9 +26,16 @@ struct mutex_config
   int spin_count;
 };
 
-extern struct mutex_config __mutex_aconf attribute_hidden;
+extern struct mutex_config __mutex_aconf;
+libc_hidden_proto (__mutex_aconf)
 
 extern void __pthread_tunables_init (void) attribute_hidden;
+#else
+static inline void
+__pthread_tunables_init (void)
+{
+  /* No tunables to initialize.  */
+}
 #endif
 
 #endif
diff --git a/sysdeps/pthread/pthread_mutex_conf.h b/sysdeps/pthread/pthread_mutex_conf.h
new file mode 100644
index 0000000000..c999c980f7
--- /dev/null
+++ b/sysdeps/pthread/pthread_mutex_conf.h
@@ -0,0 +1,28 @@
+/* Pthread mutex tunable parameters.  Generic version.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _PTHREAD_MUTEX_CONF_H
+#define _PTHREAD_MUTEX_CONF_H 1
+
+static inline void
+__pthread_tunables_init (void)
+{
+  /* The generic version does not have any tunables to init.  */
+}
+
+#endif