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kernel add
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#ifndef _ASM_MICROBLAZE_CMPXCHG_H
#define _ASM_MICROBLAZE_CMPXCHG_H
#include <linux/irqflags.h>
void __bad_xchg(volatile void *ptr, int size);
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
int size)
{
unsigned long ret;
unsigned long flags;
switch (size) {
case 1:
local_irq_save(flags);
ret = *(volatile unsigned char *)ptr;
*(volatile unsigned char *)ptr = x;
local_irq_restore(flags);
break;
case 4:
local_irq_save(flags);
ret = *(volatile unsigned long *)ptr;
*(volatile unsigned long *)ptr = x;
local_irq_restore(flags);
break;
default:
__bad_xchg(ptr, size), ret = 0;
break;
}
return ret;
}
#define xchg(ptr, x) \
((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
#include <asm-generic/cmpxchg.h>
#include <asm-generic/cmpxchg-local.h>
#endif /* _ASM_MICROBLAZE_CMPXCHG_H */
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