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1 /*****************************************************************************\
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://zfsonlinux.org/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 \*****************************************************************************/
25 #ifndef _SPL_RWSEM_COMPAT_H
26 #define _SPL_RWSEM_COMPAT_H
28 #include <linux/rwsem.h>
30 #if defined(CONFIG_PREEMPT_RT_FULL)
31 #define SPL_RWSEM_SINGLE_READER_VALUE (1)
32 #define SPL_RWSEM_SINGLE_WRITER_VALUE (0)
33 #elif defined(CONFIG_RWSEM_GENERIC_SPINLOCK)
34 #define SPL_RWSEM_SINGLE_READER_VALUE (1)
35 #define SPL_RWSEM_SINGLE_WRITER_VALUE (-1)
37 #define SPL_RWSEM_SINGLE_READER_VALUE (RWSEM_ACTIVE_READ_BIAS)
38 #define SPL_RWSEM_SINGLE_WRITER_VALUE (RWSEM_ACTIVE_WRITE_BIAS)
41 /* Linux 3.16 changed activity to count for rwsem-spinlock */
42 #if defined(CONFIG_PREEMPT_RT_FULL)
43 #define RWSEM_COUNT(sem) sem->read_depth
44 #elif defined(HAVE_RWSEM_ACTIVITY)
45 #define RWSEM_COUNT(sem) sem->activity
46 /* Linux 4.8 changed count to an atomic_long_t for !rwsem-spinlock */
47 #elif defined(HAVE_RWSEM_ATOMIC_LONG_COUNT)
48 #define RWSEM_COUNT(sem) atomic_long_read(&(sem)->count)
50 #define RWSEM_COUNT(sem) sem->count
53 int rwsem_tryupgrade(struct rw_semaphore
*rwsem
);
55 #if defined(RWSEM_SPINLOCK_IS_RAW)
56 #define spl_rwsem_lock_irqsave(lk, fl) raw_spin_lock_irqsave(lk, fl)
57 #define spl_rwsem_unlock_irqrestore(lk, fl) raw_spin_unlock_irqrestore(lk, fl)
58 #define spl_rwsem_trylock_irqsave(lk, fl) raw_spin_trylock_irqsave(lk, fl)
60 #define spl_rwsem_lock_irqsave(lk, fl) spin_lock_irqsave(lk, fl)
61 #define spl_rwsem_unlock_irqrestore(lk, fl) spin_unlock_irqrestore(lk, fl)
62 #define spl_rwsem_trylock_irqsave(lk, fl) spin_trylock_irqsave(lk, fl)
63 #endif /* RWSEM_SPINLOCK_IS_RAW */
65 #define spl_rwsem_is_locked(rwsem) rwsem_is_locked(rwsem)
67 #endif /* _SPL_RWSEM_COMPAT_H */