nptl: Move elision implementations into libc

The elision interfaces are closely aligned between the targets that
implement them, so declare them in the generic <lowlevellock.h>
file.

Empty .c stubs are provided, so that fewer makefile updates
under sysdeps are needed.  Also simplify initialization via
__libc_early_init.

The symbols __lll_clocklock_elision, __lll_lock_elision,
__lll_trylock_elision, __lll_unlock_elision, __pthread_force_elision
move into libc.  For the time being, non-hidden references are used
from libpthread to access them, but once that part of libpthread
is moved into libc, hidden symbols will be used again.  (Hidden
references seem desirable to reduce the likelihood of transactions
aborts.)

1 files changed, 0 insertions, 49 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
deleted file mode 100644
index 65962020c6..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/* PowerPC specific lock definitions.
-   Copyright (C) 2015-2021 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 _POWERPC_LOWLEVELLOCK_H
-#define _POWERPC_LOWLEVELLOCK_H 1
-
-#include <sysdeps/nptl/lowlevellock.h>
-
-/* Transactional lock elision definitions.  */
-extern int __lll_clocklock_elision
-  (int *futex, short *adapt_count,
-   clockid_t clockid, const struct __timespec64 *timeout, int private)
-  attribute_hidden;
-
-#define lll_clocklock_elision(futex, adapt_count, clockid, timeout, private) \
-  __lll_clocklock_elision (&(futex), &(adapt_count), clockid, timeout, private)
-
-extern int __lll_lock_elision (int *futex, short *adapt_count, int private)
-  attribute_hidden;
-
-extern int __lll_unlock_elision (int *lock, short *adapt_count, int private)
-  attribute_hidden;
-
-extern int __lll_trylock_elision(int *lock, short *adapt_count)
-  attribute_hidden;
-
-#define lll_lock_elision(futex, adapt_count, private) \
-  __lll_lock_elision (&(futex), &(adapt_count), private)
-#define lll_unlock_elision(futex, adapt_count, private) \
-  __lll_unlock_elision (&(futex), &(adapt_count), private)
-#define lll_trylock_elision(futex, adapt_count) \
-  __lll_trylock_elision (&(futex), &(adapt_count))
-
-#endif