--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -138,10 +138,10 @@ config ARM_TICKET_LOCKS
config RWSEM_GENERIC_SPINLOCK
bool
- default y
config RWSEM_XCHGADD_ALGORITHM
bool
+ default y
config ARCH_HAS_ILOG2_U32
bool
--- /dev/null
+++ b/arch/arm/include/asm/rwsem.h
@@ -0,0 +1,139 @@
+/* rwsem.h: R/W semaphores implemented using ARM atomic functions.
+ *
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_ARM_RWSEM_H
+#define _ASM_ARM_RWSEM_H
+
+#ifndef _LINUX_RWSEM_H
+#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
+#endif
+
+#ifdef __KERNEL__
+#include <asm/atomic.h>
+#include <asm/system.h>
+
+#define RWSEM_UNLOCKED_VALUE 0x00000000
+#define RWSEM_ACTIVE_BIAS 0x00000001
+#define RWSEM_ACTIVE_MASK 0x0000ffff
+#define RWSEM_WAITING_BIAS (-0x00010000)
+#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
+#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+
+/*
+ * lock for reading
+ */
+static inline void __down_read(struct rw_semaphore *sem)
+{
+ if (atomic_inc_return((atomic_t *)(&sem->count)) < 0)
+ rwsem_down_read_failed(sem);
+}
+
+static inline int __down_read_trylock(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ while ((tmp = sem->count) >= 0) {
+ if (tmp == cmpxchg(&sem->count, tmp,
+ tmp + RWSEM_ACTIVE_READ_BIAS)) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * lock for writing
+ */
+static inline void __down_write(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
+ (atomic_t *)(&sem->count));
+ if (tmp != RWSEM_ACTIVE_WRITE_BIAS)
+ rwsem_down_write_failed(sem);
+}
+
+static inline int __down_write_trylock(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
+ RWSEM_ACTIVE_WRITE_BIAS);
+ return tmp == RWSEM_UNLOCKED_VALUE;
+}
+
+/*
+ * unlock after reading
+ */
+static inline void __up_read(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ tmp = atomic_dec_return((atomic_t *)(&sem->count));
+ if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0)
+ rwsem_wake(sem);
+}
+
+/*
+ * unlock after writing
+ */
+static inline void __up_write(struct rw_semaphore *sem)
+{
+ if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
+ (atomic_t *)(&sem->count)) < 0)
+ rwsem_wake(sem);
+}
+
+/*
+ * implement atomic add functionality
+ */
+static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
+{
+ atomic_add(delta, (atomic_t *)(&sem->count));
+}
+
+/*
+ * downgrade write lock to read lock
+ */
+static inline void __downgrade_write(struct rw_semaphore *sem)
+{
+ int tmp;
+
+ tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
+ if (tmp < 0)
+ rwsem_downgrade_wake(sem);
+}
+
+static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
+{
+ __down_write(sem);
+}
+
+/*
+ * implement exchange and add functionality
+ */
+static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
+{
+ return atomic_add_return(delta, (atomic_t *)(&sem->count));
+}
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_ARM_RWSEM_H */
+
projects / ziggy471-shooter-u-ics-kernel.git / commitdiff