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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_SPINLOCK_H #define _ASM_X86_SPINLOCK_H #include <linux/jump_label.h> #include <linux/atomic.h> #include <asm/page.h> #include <asm/processor.h> #include <linux/compiler.h> #include <asm/paravirt.h> #include <asm/bitops.h> /* * Your basic SMP spinlocks, allowing only a single CPU anywhere * * Simple spin lock operations. There are two variants, one clears IRQ's * on the local processor, one does not. * * These are fair FIFO ticket locks, which support up to 2^16 CPUs. * * (the type definitions are in asm/spinlock_types.h) */ /* How long a lock should spin before we consider blocking */ #define SPIN_THRESHOLD (1 << 15) #include <asm/qspinlock.h> /* * 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. * * On x86, we implement read-write locks using the generic qrwlock with * x86 specific optimization. */ #include <asm/qrwlock.h> #endif /* _ASM_X86_SPINLOCK_H */