/* 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 */
Messung V0.5 in Prozent C=90 H=-100 G=95
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