projects / mirror_spl-debian.git / blame
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|---|---|---|
| 46aa7b39 NB |
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>. | |
| 6 | * UCRL-CODE-235197 | |
| 7 | * | |
| 8 | * This file is part of the SPL, Solaris Porting Layer. | |
| 3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
| 46aa7b39 NB |
10 | * |
| 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. | |
| 15 | * | |
| 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 | |
| 19 | * for more details. | |
| 20 | * | |
| 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 | \*****************************************************************************/ | |
| 24 | ||
| 25 | #ifndef _SPL_RWSEM_COMPAT_H | |
| 26 | #define _SPL_RWSEM_COMPAT_H | |
| 27 | ||
| 28 | #include <linux/rwsem.h> | |
| 29 | ||
| ec06701b AX |
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) | |
| 0f836a62 AX |
34 | #define SPL_RWSEM_SINGLE_READER_VALUE (1) |
| 35 | #define SPL_RWSEM_SINGLE_WRITER_VALUE (-1) | |
| 36 | #else | |
| 37 | #define SPL_RWSEM_SINGLE_READER_VALUE (RWSEM_ACTIVE_READ_BIAS) | |
| 38 | #define SPL_RWSEM_SINGLE_WRITER_VALUE (RWSEM_ACTIVE_WRITE_BIAS) | |
| 39 | #endif | |
| 40 | ||
| 41 | /* Linux 3.16 changed activity to count for rwsem-spinlock */ | |
| ec06701b AX |
42 | #if defined(CONFIG_PREEMPT_RT_FULL) |
| 43 | #define RWSEM_COUNT(sem) sem->read_depth | |
| 44 | #elif defined(HAVE_RWSEM_ACTIVITY) | |
| 0f836a62 AX |
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) | |
| 49 | #else | |
| 50 | #define RWSEM_COUNT(sem) sem->count | |
| 51 | #endif | |
| 52 | ||
| 53 | int rwsem_tryupgrade(struct rw_semaphore *rwsem); | |
| 54 | ||
| d503b971 BB |
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) | |
| 588d9004 | 59 | #else |
| d503b971 BB |
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) | |
| 588d9004 DH |
63 | #endif /* RWSEM_SPINLOCK_IS_RAW */ |
| 64 | ||
| d503b971 | 65 | #define spl_rwsem_is_locked(rwsem) rwsem_is_locked(rwsem) |
| 46aa7b39 NB |
66 | |
| 67 | #endif /* _SPL_RWSEM_COMPAT_H */ |