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author | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2008-10-11 12:39:35 -0700 |
commit | 56c5d900dbb8e042bfad035d18433476931d8f93 (patch) | |
tree | 00b793965beeef10db03e0ff021d2d965c410759 /include/asm-mips/spinlock.h | |
parent | 4dd95b63ae25c5cad6986829b5e8788e9faa0330 (diff) | |
parent | ead9d23d803ea3a73766c3cb27bf7563ac8d7266 (diff) | |
download | op-kernel-dev-56c5d900dbb8e042bfad035d18433476931d8f93.zip op-kernel-dev-56c5d900dbb8e042bfad035d18433476931d8f93.tar.gz |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
sound/core/memalloc.c
Diffstat (limited to 'include/asm-mips/spinlock.h')
-rw-r--r-- | include/asm-mips/spinlock.h | 376 |
1 files changed, 0 insertions, 376 deletions
diff --git a/include/asm-mips/spinlock.h b/include/asm-mips/spinlock.h deleted file mode 100644 index bb89701..0000000 --- a/include/asm-mips/spinlock.h +++ /dev/null @@ -1,376 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 1999, 2000, 06 Ralf Baechle (ralf@linux-mips.org) - * Copyright (C) 1999, 2000 Silicon Graphics, Inc. - */ -#ifndef _ASM_SPINLOCK_H -#define _ASM_SPINLOCK_H - -#include <asm/barrier.h> -#include <asm/war.h> - -/* - * Your basic SMP spinlocks, allowing only a single CPU anywhere - */ - -#define __raw_spin_is_locked(x) ((x)->lock != 0) -#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) -#define __raw_spin_unlock_wait(x) \ - do { cpu_relax(); } while ((x)->lock) - -/* - * Simple spin lock operations. There are two variants, one clears IRQ's - * on the local processor, one does not. - * - * We make no fairness assumptions. They have a cost. - */ - -static inline void __raw_spin_lock(raw_spinlock_t *lock) -{ - unsigned int tmp; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_spin_lock \n" - "1: ll %1, %2 \n" - " bnez %1, 1b \n" - " li %1, 1 \n" - " sc %1, %0 \n" - " beqzl %1, 1b \n" - " nop \n" - " .set reorder \n" - : "=m" (lock->lock), "=&r" (tmp) - : "m" (lock->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_spin_lock \n" - "1: ll %1, %2 \n" - " bnez %1, 2f \n" - " li %1, 1 \n" - " sc %1, %0 \n" - " beqz %1, 2f \n" - " nop \n" - " .subsection 2 \n" - "2: ll %1, %2 \n" - " bnez %1, 2b \n" - " li %1, 1 \n" - " b 1b \n" - " nop \n" - " .previous \n" - " .set reorder \n" - : "=m" (lock->lock), "=&r" (tmp) - : "m" (lock->lock) - : "memory"); - } - - smp_llsc_mb(); -} - -static inline void __raw_spin_unlock(raw_spinlock_t *lock) -{ - smp_mb(); - - __asm__ __volatile__( - " .set noreorder # __raw_spin_unlock \n" - " sw $0, %0 \n" - " .set\treorder \n" - : "=m" (lock->lock) - : "m" (lock->lock) - : "memory"); -} - -static inline unsigned int __raw_spin_trylock(raw_spinlock_t *lock) -{ - unsigned int temp, res; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_spin_trylock \n" - "1: ll %0, %3 \n" - " ori %2, %0, 1 \n" - " sc %2, %1 \n" - " beqzl %2, 1b \n" - " nop \n" - " andi %2, %0, 1 \n" - " .set reorder" - : "=&r" (temp), "=m" (lock->lock), "=&r" (res) - : "m" (lock->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_spin_trylock \n" - "1: ll %0, %3 \n" - " ori %2, %0, 1 \n" - " sc %2, %1 \n" - " beqz %2, 2f \n" - " andi %2, %0, 1 \n" - " .subsection 2 \n" - "2: b 1b \n" - " nop \n" - " .previous \n" - " .set reorder" - : "=&r" (temp), "=m" (lock->lock), "=&r" (res) - : "m" (lock->lock) - : "memory"); - } - - smp_llsc_mb(); - - return res == 0; -} - -/* - * Read-write spinlocks, allowing multiple readers but only one writer. - * - * NOTE! it is quite common to have readers in interrupts but no interrupt - * writers. For those circumstances we can "mix" irq-safe locks - any writer - * needs to get a irq-safe write-lock, but readers can get non-irqsafe - * read-locks. - */ - -/* - * read_can_lock - would read_trylock() succeed? - * @lock: the rwlock in question. - */ -#define __raw_read_can_lock(rw) ((rw)->lock >= 0) - -/* - * write_can_lock - would write_trylock() succeed? - * @lock: the rwlock in question. - */ -#define __raw_write_can_lock(rw) (!(rw)->lock) - -static inline void __raw_read_lock(raw_rwlock_t *rw) -{ - unsigned int tmp; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_read_lock \n" - "1: ll %1, %2 \n" - " bltz %1, 1b \n" - " addu %1, 1 \n" - " sc %1, %0 \n" - " beqzl %1, 1b \n" - " nop \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_read_lock \n" - "1: ll %1, %2 \n" - " bltz %1, 2f \n" - " addu %1, 1 \n" - " sc %1, %0 \n" - " beqz %1, 1b \n" - " nop \n" - " .subsection 2 \n" - "2: ll %1, %2 \n" - " bltz %1, 2b \n" - " addu %1, 1 \n" - " b 1b \n" - " nop \n" - " .previous \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } - - smp_llsc_mb(); -} - -/* Note the use of sub, not subu which will make the kernel die with an - overflow exception if we ever try to unlock an rwlock that is already - unlocked or is being held by a writer. */ -static inline void __raw_read_unlock(raw_rwlock_t *rw) -{ - unsigned int tmp; - - smp_llsc_mb(); - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - "1: ll %1, %2 # __raw_read_unlock \n" - " sub %1, 1 \n" - " sc %1, %0 \n" - " beqzl %1, 1b \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_read_unlock \n" - "1: ll %1, %2 \n" - " sub %1, 1 \n" - " sc %1, %0 \n" - " beqz %1, 2f \n" - " nop \n" - " .subsection 2 \n" - "2: b 1b \n" - " nop \n" - " .previous \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } -} - -static inline void __raw_write_lock(raw_rwlock_t *rw) -{ - unsigned int tmp; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_write_lock \n" - "1: ll %1, %2 \n" - " bnez %1, 1b \n" - " lui %1, 0x8000 \n" - " sc %1, %0 \n" - " beqzl %1, 1b \n" - " nop \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_write_lock \n" - "1: ll %1, %2 \n" - " bnez %1, 2f \n" - " lui %1, 0x8000 \n" - " sc %1, %0 \n" - " beqz %1, 2f \n" - " nop \n" - " .subsection 2 \n" - "2: ll %1, %2 \n" - " bnez %1, 2b \n" - " lui %1, 0x8000 \n" - " b 1b \n" - " nop \n" - " .previous \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp) - : "m" (rw->lock) - : "memory"); - } - - smp_llsc_mb(); -} - -static inline void __raw_write_unlock(raw_rwlock_t *rw) -{ - smp_mb(); - - __asm__ __volatile__( - " # __raw_write_unlock \n" - " sw $0, %0 \n" - : "=m" (rw->lock) - : "m" (rw->lock) - : "memory"); -} - -static inline int __raw_read_trylock(raw_rwlock_t *rw) -{ - unsigned int tmp; - int ret; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_read_trylock \n" - " li %2, 0 \n" - "1: ll %1, %3 \n" - " bltz %1, 2f \n" - " addu %1, 1 \n" - " sc %1, %0 \n" - " .set reorder \n" - " beqzl %1, 1b \n" - " nop \n" - __WEAK_LLSC_MB - " li %2, 1 \n" - "2: \n" - : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret) - : "m" (rw->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_read_trylock \n" - " li %2, 0 \n" - "1: ll %1, %3 \n" - " bltz %1, 2f \n" - " addu %1, 1 \n" - " sc %1, %0 \n" - " beqz %1, 1b \n" - " nop \n" - " .set reorder \n" - __WEAK_LLSC_MB - " li %2, 1 \n" - "2: \n" - : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret) - : "m" (rw->lock) - : "memory"); - } - - return ret; -} - -static inline int __raw_write_trylock(raw_rwlock_t *rw) -{ - unsigned int tmp; - int ret; - - if (R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set noreorder # __raw_write_trylock \n" - " li %2, 0 \n" - "1: ll %1, %3 \n" - " bnez %1, 2f \n" - " lui %1, 0x8000 \n" - " sc %1, %0 \n" - " beqzl %1, 1b \n" - " nop \n" - __WEAK_LLSC_MB - " li %2, 1 \n" - " .set reorder \n" - "2: \n" - : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret) - : "m" (rw->lock) - : "memory"); - } else { - __asm__ __volatile__( - " .set noreorder # __raw_write_trylock \n" - " li %2, 0 \n" - "1: ll %1, %3 \n" - " bnez %1, 2f \n" - " lui %1, 0x8000 \n" - " sc %1, %0 \n" - " beqz %1, 3f \n" - " li %2, 1 \n" - "2: \n" - __WEAK_LLSC_MB - " .subsection 2 \n" - "3: b 1b \n" - " li %2, 0 \n" - " .previous \n" - " .set reorder \n" - : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret) - : "m" (rw->lock) - : "memory"); - } - - return ret; -} - - -#define _raw_spin_relax(lock) cpu_relax() -#define _raw_read_relax(lock) cpu_relax() -#define _raw_write_relax(lock) cpu_relax() - -#endif /* _ASM_SPINLOCK_H */ |