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11/17/2022 06:42:16 AM
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Kbuild
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asm-offsets.h
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atomic.h
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atomic_32.h
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barrier.h
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bitops.h
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bitops_64.h
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cache.h
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cacheflush.h
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checksum.h
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cmpxchg.h
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compat.h
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current.h
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elf.h
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hardirq.h
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hardwall.h
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highmem.h
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homecache.h
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hv_driver.h
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io.h
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irq.h
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irq_work.h
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irqflags.h
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kexec.h
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kgdb.h
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kmap_types.h
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kprobes.h
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linkage.h
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mmu.h
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mmu_context.h
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mmzone.h
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module.h
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page.h
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pci.h
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percpu.h
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perf_event.h
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pgalloc.h
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pgtable.h
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pgtable_32.h
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pgtable_64.h
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ptrace.h
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sections.h
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setup.h
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sigframe.h
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signal.h
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smp.h
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spinlock.h
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spinlock_32.h
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spinlock_64.h
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spinlock_types.h
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stack.h
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string.h
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switch_to.h
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syscall.h
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syscalls.h
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thread_info.h
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tile-desc.h
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tile-desc_32.h
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tile-desc_64.h
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timex.h
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tlb.h
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tlbflush.h
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topology.h
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traps.h
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uaccess.h
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unaligned.h
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unistd.h
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user.h
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vdso.h
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vga.h
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word-at-a-time.h
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Editing: spinlock_32.h
Close
/* * Copyright 2010 Tilera Corporation. 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 * as published by the Free Software Foundation, version 2. * * 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, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * * 32-bit SMP spinlocks. */ #ifndef _ASM_TILE_SPINLOCK_32_H #define _ASM_TILE_SPINLOCK_32_H #include <linux/atomic.h> #include <asm/page.h> #include <linux/compiler.h> /* * We only use even ticket numbers so the '1' inserted by a tns is * an unambiguous "ticket is busy" flag. */ #define TICKET_QUANTUM 2 /* * SMP ticket spinlocks, allowing only a single CPU anywhere * * (the type definitions are in asm/spinlock_types.h) */ static inline int arch_spin_is_locked(arch_spinlock_t *lock) { /* * Note that even if a new ticket is in the process of being * acquired, so lock->next_ticket is 1, it's still reasonable * to claim the lock is held, since it will be momentarily * if not already. There's no need to wait for a "valid" * lock->next_ticket to become available. * Use READ_ONCE() to ensure that calling this in a loop is OK. */ int curr = READ_ONCE(lock->current_ticket); int next = READ_ONCE(lock->next_ticket); return next != curr; } void arch_spin_lock(arch_spinlock_t *lock); int arch_spin_trylock(arch_spinlock_t *lock); static inline void arch_spin_unlock(arch_spinlock_t *lock) { /* For efficiency, overlap fetching the old ticket with the wmb(). */ int old_ticket = lock->current_ticket; wmb(); /* guarantee anything modified under the lock is visible */ lock->current_ticket = old_ticket + TICKET_QUANTUM; } /* * Read-write spinlocks, allowing multiple readers * but only one writer. * * We use a "tns/store-back" technique on a single word to manage * the lock state, looping around to retry if the tns returns 1. */ /* Internal layout of the word; do not use. */ #define _WR_NEXT_SHIFT 8 #define _WR_CURR_SHIFT 16 #define _WR_WIDTH 8 #define _RD_COUNT_SHIFT 24 #define _RD_COUNT_WIDTH 8 /** * arch_read_lock() - acquire a read lock. */ void arch_read_lock(arch_rwlock_t *rwlock); /** * arch_write_lock() - acquire a write lock. */ void arch_write_lock(arch_rwlock_t *rwlock); /** * arch_read_trylock() - try to acquire a read lock. */ int arch_read_trylock(arch_rwlock_t *rwlock); /** * arch_write_trylock() - try to acquire a write lock. */ int arch_write_trylock(arch_rwlock_t *rwlock); /** * arch_read_unlock() - release a read lock. */ void arch_read_unlock(arch_rwlock_t *rwlock); /** * arch_write_unlock() - release a write lock. */ void arch_write_unlock(arch_rwlock_t *rwlock); #endif /* _ASM_TILE_SPINLOCK_32_H */