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//usr/src/linux-headers-5.4.0-216/arch/sh/include/asm/cmpxchg-irq.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SH_CMPXCHG_IRQ_H #define __ASM_SH_CMPXCHG_IRQ_H #include <linux/irqflags.h> static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) { unsigned long flags, retval; local_irq_save(flags); retval = *m; *m = val; local_irq_restore(flags); return retval; } static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val) { unsigned long flags, retval; local_irq_save(flags); retval = *m; *m = val; local_irq_restore(flags); return retval; } static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) { unsigned long flags, retval; local_irq_save(flags); retval = *m; *m = val & 0xff; local_irq_restore(flags); return retval; } static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, unsigned long new) { __u32 retval; unsigned long flags; local_irq_save(flags); retval = *m; if (retval == old) *m = new; local_irq_restore(flags); /* implies memory barrier */ return retval; } #endif /* __ASM_SH_CMPXCHG_IRQ_H */