LXR linux/arch/sh/include/asm/atomic-irq.h

   1#ifndef __ASM_SH_ATOMIC_IRQ_H
   2#define __ASM_SH_ATOMIC_IRQ_H
   3
   4#include <linux/irqflags.h>
   5
   6/*
   7 * To get proper branch prediction for the main line, we must branch
   8 * forward to code at the end of this object's .text section, then
   9 * branch back to restart the operation.
  10 */
  11
  12#define ATOMIC_OP(op, c_op)                                             \
  13static inline void atomic_##op(int i, atomic_t *v)                      \
  14{                                                                       \
  15        unsigned long flags;                                            \
  16                                                                        \
  17        raw_local_irq_save(flags);                                      \
  18        v->counter c_op i;                                              \
  19        raw_local_irq_restore(flags);                                   \
  20}
  21
  22#define ATOMIC_OP_RETURN(op, c_op)                                      \
  23static inline int atomic_##op##_return(int i, atomic_t *v)              \
  24{                                                                       \
  25        unsigned long temp, flags;                                      \
  26                                                                        \
  27        raw_local_irq_save(flags);                                      \
  28        temp = v->counter;                                              \
  29        temp c_op i;                                                    \
  30        v->counter = temp;                                              \
  31        raw_local_irq_restore(flags);                                   \
  32                                                                        \
  33        return temp;                                                    \
  34}
  35
  36#define ATOMIC_OPS(op, c_op) ATOMIC_OP(op, c_op) ATOMIC_OP_RETURN(op, c_op)
  37
  38ATOMIC_OPS(add, +=)
  39ATOMIC_OPS(sub, -=)
  40ATOMIC_OP(and, &=)
  41ATOMIC_OP(or, |=)
  42ATOMIC_OP(xor, ^=)
  43
  44#undef ATOMIC_OPS
  45#undef ATOMIC_OP_RETURN
  46#undef ATOMIC_OP
  47
  48#endif /* __ASM_SH_ATOMIC_IRQ_H */
  49