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 LICENSE.txt 2021-10-22 11:13 1.1K 
Al4( (  fB- h_I|+ai~ *j"T[Tţ/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Queue read/write lock * * These use generic atomic and locking routines, but depend on a fair spinlock * implementation in order to be fair themselves. The implementation in * asm-generic/spinlock.h meets these requirements. * * (C) Copyright 2013-2014 Hewlett-Packard Development Company, L.P. * * Authors: Waiman Long */ #ifndef __ASM_GENERIC_QRWLOCK_H #define __ASM_GENERIC_QRWLOCK_H #include #include #include #include /* Must be included from asm/spinlock.h after defining arch_spin_is_locked. */ /* * Writer states & reader shift and bias. */ #define _QW_WAITING 0x100 /* A writer is waiting */ #define _QW_LOCKED 0x0ff /* A writer holds the lock */ #define _QW_WMASK 0x1ff /* Writer mask */ #define _QR_SHIFT 9 /* Reader count shift */ #define _QR_BIAS (1U << _QR_SHIFT) /* * External function declarations */ extern void queued_read_lock_slowpath(struct qrwlock *lock); extern void queued_write_lock_slowpath(struct qrwlock *lock); /** * queued_read_trylock - try to acquire read lock of a queued rwlock * @lock : Pointer to queued rwlock structure * Return: 1 if lock acquired, 0 if failed */ static inline int queued_read_trylock(struct qrwlock *lock) { int cnts; cnts = atomic_read(&lock->cnts); if (likely(!(cnts & _QW_WMASK))) { cnts = (u32)atomic_add_return_acquire(_QR_BIAS, &lock->cnts); if (likely(!(cnts & _QW_WMASK))) return 1; atomic_sub(_QR_BIAS, &lock->cnts); } return 0; } /** * queued_write_trylock - try to acquire write lock of a queued rwlock * @lock : Pointer to queued rwlock structure * Return: 1 if lock acquired, 0 if failed */ static inline int queued_write_trylock(struct qr