nptl: Move lowlevellock into libc [BZ #15648]

And export __lll_lock_wait and __lll_lock_wait_private as
GLIBC_PRIVATE.  This should eliminate the need for the previous
riscv kludge.

nptl/Makefile

@@ -33,9 +33,9 @@ routines = \
   forward \
   libc-cancellation \
   libc-cleanup \
-  libc-lowlevellock \
   libc_multiple_threads \
   libc_pthread_init \
+  lowlevellock \
   old_pthread_cond_destroy \
   old_pthread_cond_init \
   pthread_atfork \
@@ -100,7 +100,6 @@ libpthread-routines = \
   futex-internal \
   herrno \
   libpthread-compat \
-  lowlevellock \
   nptl-init \
   nptlfreeres \
   old_pthread_atfork \

nptl/Versions

@@ -77,6 +77,8 @@ libc {
     __libc_current_sigrtmin_private;
     __libc_dl_error_tsd;
     __libc_pthread_init;
+    __lll_lock_wait;
+    __lll_lock_wait_private;
     __pthread_attr_copy;
     __pthread_attr_destroy;
     __pthread_attr_init;

nptl/libc-lowlevellock.c

@@ -1,20 +0,0 @@
-/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
-
-   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/>.  */
-
-/* No difference to lowlevellock.c, except we lose a couple of functions.  */
-#include <lowlevellock.c>

nptl/lowlevellock.c

@@ -35,10 +35,8 @@ __lll_lock_wait_private (int *futex)
       futex_wait ((unsigned int *) futex, 2, LLL_PRIVATE); /* Wait if *futex == 2.  */
     }
 }
+libc_hidden_def (__lll_lock_wait_private)
 
-
-/* This function doesn't get included in libc.  */
-#if IS_IN (libpthread)
 void
 __lll_lock_wait (int *futex, int private)
 {
@@ -52,4 +50,4 @@ __lll_lock_wait (int *futex, int private)
       futex_wait ((unsigned int *) futex, 2, private); /* Wait if *futex == 2.  */
     }
 }
-#endif
+libc_hidden_def (__lll_lock_wait)

sysdeps/nptl/lowlevellock.h

@@ -75,8 +75,10 @@
 #define lll_cond_trylock(lock)	\
   __glibc_unlikely (atomic_compare_and_exchange_bool_acq (&(lock), 2, 0))
 
-extern void __lll_lock_wait_private (int *futex) attribute_hidden;
-extern void __lll_lock_wait (int *futex, int private) attribute_hidden;
+extern void __lll_lock_wait_private (int *futex);
+libc_hidden_proto (__lll_lock_wait_private)
+extern void __lll_lock_wait (int *futex, int private);
+libc_hidden_proto (__lll_lock_wait)
 
 /* This is an expression rather than a statement even though its value is
    void, so that it can be used in a comma expression or as an expression

sysdeps/riscv/nptl/libc-lowlevellock.c

@@ -1,8 +0,0 @@
-/* This kludge works around a libpthread static linking problem:
-   https://sourceware.org/bugzilla/show_bug.cgi?id=15648.  */
-
-#ifndef SHARED
-# define __lll_lock_wait_private weak_function __lll_lock_wait_private
-#endif
-
-#include <lowlevellock.c>