mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-18 10:21:01 +03:00
588d900433
The wait_lock member of the rw_semaphore struct became a raw_spinlock_t in Linux 3.2 at torvalds/linux@ddb6c9b58a. Wrap spin_lock_* function calls in a new spl_rwsem_* interface to ensure type safety if raw_spinlock_t becomes architecture specific, and to satisfy these compiler warnings: warning: passing argument 1 of ‘spinlock_check’ from incompatible pointer type [enabled by default] note: expected ‘struct spinlock_t *’ but argument is of type ‘struct raw_spinlock_t *’ Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes: #76 Closes: zfsonlinux/zfs#463
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*****************************************************************************\
|
|
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
|
|
* Copyright (C) 2007 The Regents of the University of California.
|
|
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
|
|
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
|
|
* UCRL-CODE-235197
|
|
*
|
|
* This file is part of the SPL, Solaris Porting Layer.
|
|
* For details, see <http://github.com/behlendorf/spl/>.
|
|
*
|
|
* The SPL is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* The SPL 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 General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
|
|
\*****************************************************************************/
|
|
|
|
#ifndef _SPL_RWSEM_COMPAT_H
|
|
#define _SPL_RWSEM_COMPAT_H
|
|
|
|
#include <linux/rwsem.h>
|
|
|
|
#ifdef RWSEM_SPINLOCK_IS_RAW
|
|
#define spl_rwsem_lock_irqsave(lock, flags) \
|
|
({ \
|
|
raw_spin_lock_irqsave(lock, flags); \
|
|
})
|
|
#define spl_rwsem_unlock_irqrestore(lock, flags) \
|
|
({ \
|
|
raw_spin_unlock_irqrestore(lock, flags); \
|
|
})
|
|
#else
|
|
#define spl_rwsem_lock_irqsave(lock, flags) \
|
|
({ \
|
|
spin_lock_irqsave(lock, flags); \
|
|
})
|
|
#define spl_rwsem_unlock_irqrestore(lock, flags) \
|
|
({ \
|
|
spin_unlock_irqrestore(lock, flags); \
|
|
})
|
|
#endif /* RWSEM_SPINLOCK_IS_RAW */
|
|
|
|
#ifdef RWSEM_IS_LOCKED_TAKES_WAIT_LOCK
|
|
/*
|
|
* A race condition in rwsem_is_locked() was fixed in Linux 2.6.33 and the fix
|
|
* was backported to RHEL5 as of kernel 2.6.18-190.el5. Details can be found
|
|
* here:
|
|
*
|
|
* https://bugzilla.redhat.com/show_bug.cgi?id=526092
|
|
|
|
* The race condition was fixed in the kernel by acquiring the semaphore's
|
|
* wait_lock inside rwsem_is_locked(). The SPL worked around the race
|
|
* condition by acquiring the wait_lock before calling that function, but
|
|
* with the fix in place we must not do that.
|
|
*/
|
|
|
|
#define spl_rwsem_is_locked(rwsem) \
|
|
({ \
|
|
rwsem_is_locked(rwsem); \
|
|
})
|
|
|
|
#else
|
|
|
|
#define spl_rwsem_is_locked(rwsem) \
|
|
({ \
|
|
unsigned long _flags_; \
|
|
int _rc_; \
|
|
spl_rwsem_lock_irqsave(&rwsem->wait_lock, _flags_); \
|
|
_rc_ = rwsem_is_locked(rwsem); \
|
|
spl_rwsem_unlock_irqrestore(&rwsem->wait_lock, _flags_); \
|
|
_rc_; \
|
|
})
|
|
|
|
#endif /* RWSEM_IS_LOCKED_TAKES_WAIT_LOCK */
|
|
|
|
#endif /* _SPL_RWSEM_COMPAT_H */
|