root/arch/sh/include/asm/atomic.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_ATOMIC_H
   3 #define __ASM_SH_ATOMIC_H
   4 
   5 #if defined(CONFIG_CPU_J2)
   6 
   7 #include <asm-generic/atomic.h>
   8 
   9 #else
  10 
  11 /*
  12  * Atomic operations that C can't guarantee us.  Useful for
  13  * resource counting etc..
  14  *
  15  */
  16 
  17 #include <linux/compiler.h>
  18 #include <linux/types.h>
  19 #include <asm/cmpxchg.h>
  20 #include <asm/barrier.h>
  21 
  22 #define ATOMIC_INIT(i)  { (i) }
  23 
  24 #define atomic_read(v)          READ_ONCE((v)->counter)
  25 #define atomic_set(v,i)         WRITE_ONCE((v)->counter, (i))
  26 
  27 #if defined(CONFIG_GUSA_RB)
  28 #include <asm/atomic-grb.h>
  29 #elif defined(CONFIG_CPU_SH4A)
  30 #include <asm/atomic-llsc.h>
  31 #else
  32 #include <asm/atomic-irq.h>
  33 #endif
  34 
  35 #define atomic_xchg(v, new)             (xchg(&((v)->counter), new))
  36 #define atomic_cmpxchg(v, o, n)         (cmpxchg(&((v)->counter), (o), (n)))
  37 
  38 #endif /* CONFIG_CPU_J2 */
  39 
  40 #endif /* __ASM_SH_ATOMIC_H */