diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/compiler.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/compiler.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/compiler.h b/sys/compat/linuxkpi/common/include/linux/compiler.h index 6381358..b6ea98f 100644 --- a/sys/compat/linuxkpi/common/include/linux/compiler.h +++ b/sys/compat/linuxkpi/common/include/linux/compiler.h @@ -72,4 +72,20 @@ #define barrier() __asm__ __volatile__("": : :"memory") +#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x)) + +#define WRITE_ONCE(x,v) do { \ + barrier(); \ + ACCESS_ONCE(x) = (v); \ + barrier(); \ +} while (0) + +#define READ_ONCE(x) ({ \ + __typeof(x) __var; \ + barrier(); \ + __var = ACCESS_ONCE(x); \ + barrier(); \ + __var; \ +}) + #endif /* _LINUX_COMPILER_H_ */ |
