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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/include/linux/bit_spinlock.h | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/include/linux/bit_spinlock.h')
-rw-r--r-- | ANDROID_3.4.5/include/linux/bit_spinlock.h | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/ANDROID_3.4.5/include/linux/bit_spinlock.h b/ANDROID_3.4.5/include/linux/bit_spinlock.h deleted file mode 100644 index 3b5bafce..00000000 --- a/ANDROID_3.4.5/include/linux/bit_spinlock.h +++ /dev/null @@ -1,100 +0,0 @@ -#ifndef __LINUX_BIT_SPINLOCK_H -#define __LINUX_BIT_SPINLOCK_H - -#include <linux/kernel.h> -#include <linux/preempt.h> -#include <linux/atomic.h> -#include <linux/bug.h> - -/* - * bit-based spin_lock() - * - * Don't use this unless you really need to: spin_lock() and spin_unlock() - * are significantly faster. - */ -static inline void bit_spin_lock(int bitnum, unsigned long *addr) -{ - /* - * Assuming the lock is uncontended, this never enters - * the body of the outer loop. If it is contended, then - * within the inner loop a non-atomic test is used to - * busywait with less bus contention for a good time to - * attempt to acquire the lock bit. - */ - preempt_disable(); -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - while (unlikely(test_and_set_bit_lock(bitnum, addr))) { - preempt_enable(); - do { - cpu_relax(); - } while (test_bit(bitnum, addr)); - preempt_disable(); - } -#endif - __acquire(bitlock); -} - -/* - * Return true if it was acquired - */ -static inline int bit_spin_trylock(int bitnum, unsigned long *addr) -{ - preempt_disable(); -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - if (unlikely(test_and_set_bit_lock(bitnum, addr))) { - preempt_enable(); - return 0; - } -#endif - __acquire(bitlock); - return 1; -} - -/* - * bit-based spin_unlock() - */ -static inline void bit_spin_unlock(int bitnum, unsigned long *addr) -{ -#ifdef CONFIG_DEBUG_SPINLOCK - BUG_ON(!test_bit(bitnum, addr)); -#endif -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - clear_bit_unlock(bitnum, addr); -#endif - preempt_enable(); - __release(bitlock); -} - -/* - * bit-based spin_unlock() - * non-atomic version, which can be used eg. if the bit lock itself is - * protecting the rest of the flags in the word. - */ -static inline void __bit_spin_unlock(int bitnum, unsigned long *addr) -{ -#ifdef CONFIG_DEBUG_SPINLOCK - BUG_ON(!test_bit(bitnum, addr)); -#endif -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - __clear_bit_unlock(bitnum, addr); -#endif - preempt_enable(); - __release(bitlock); -} - -/* - * Return true if the lock is held. - */ -static inline int bit_spin_is_locked(int bitnum, unsigned long *addr) -{ -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - return test_bit(bitnum, addr); -#elif defined CONFIG_PREEMPT_COUNT - return preempt_count(); -#else - return 1; -#endif -} - -#endif /* __LINUX_BIT_SPINLOCK_H */ - |