mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
a4c1887d4c
The arch_{read,spin,write}_lock_flags() macros are simply mapped to the
non-flags versions by the majority of architectures, so do this in core
code and remove the dummy implementations. Also remove the implementation
in spinlock_up.h, since all callers of do_raw_spin_lock_flags() call
local_irq_save(flags) anyway.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1507055129-12300-4-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
#ifndef __LINUX_SPINLOCK_UP_H
|
|
#define __LINUX_SPINLOCK_UP_H
|
|
|
|
#ifndef __LINUX_SPINLOCK_H
|
|
# error "please don't include this file directly"
|
|
#endif
|
|
|
|
#include <asm/processor.h> /* for cpu_relax() */
|
|
#include <asm/barrier.h>
|
|
|
|
/*
|
|
* include/linux/spinlock_up.h - UP-debug version of spinlocks.
|
|
*
|
|
* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
|
|
* Released under the General Public License (GPL).
|
|
*
|
|
* In the debug case, 1 means unlocked, 0 means locked. (the values
|
|
* are inverted, to catch initialization bugs)
|
|
*
|
|
* No atomicity anywhere, we are on UP. However, we still need
|
|
* the compiler barriers, because we do not want the compiler to
|
|
* move potentially faulting instructions (notably user accesses)
|
|
* into the locked sequence, resulting in non-atomic execution.
|
|
*/
|
|
|
|
#ifdef CONFIG_DEBUG_SPINLOCK
|
|
#define arch_spin_is_locked(x) ((x)->slock == 0)
|
|
|
|
static inline void arch_spin_lock(arch_spinlock_t *lock)
|
|
{
|
|
lock->slock = 0;
|
|
barrier();
|
|
}
|
|
|
|
static inline int arch_spin_trylock(arch_spinlock_t *lock)
|
|
{
|
|
char oldval = lock->slock;
|
|
|
|
lock->slock = 0;
|
|
barrier();
|
|
|
|
return oldval > 0;
|
|
}
|
|
|
|
static inline void arch_spin_unlock(arch_spinlock_t *lock)
|
|
{
|
|
barrier();
|
|
lock->slock = 1;
|
|
}
|
|
|
|
/*
|
|
* Read-write spinlocks. No debug version.
|
|
*/
|
|
#define arch_read_lock(lock) do { barrier(); (void)(lock); } while (0)
|
|
#define arch_write_lock(lock) do { barrier(); (void)(lock); } while (0)
|
|
#define arch_read_trylock(lock) ({ barrier(); (void)(lock); 1; })
|
|
#define arch_write_trylock(lock) ({ barrier(); (void)(lock); 1; })
|
|
#define arch_read_unlock(lock) do { barrier(); (void)(lock); } while (0)
|
|
#define arch_write_unlock(lock) do { barrier(); (void)(lock); } while (0)
|
|
|
|
#else /* DEBUG_SPINLOCK */
|
|
#define arch_spin_is_locked(lock) ((void)(lock), 0)
|
|
/* for sched/core.c and kernel_lock.c: */
|
|
# define arch_spin_lock(lock) do { barrier(); (void)(lock); } while (0)
|
|
# define arch_spin_lock_flags(lock, flags) do { barrier(); (void)(lock); } while (0)
|
|
# define arch_spin_unlock(lock) do { barrier(); (void)(lock); } while (0)
|
|
# define arch_spin_trylock(lock) ({ barrier(); (void)(lock); 1; })
|
|
#endif /* DEBUG_SPINLOCK */
|
|
|
|
#define arch_spin_is_contended(lock) (((void)(lock), 0))
|
|
|
|
#endif /* __LINUX_SPINLOCK_UP_H */
|