diff options
| author | ngie <ngie@FreeBSD.org> | 2015-12-29 19:56:26 +0000 |
|---|---|---|
| committer | ngie <ngie@FreeBSD.org> | 2015-12-29 19:56:26 +0000 |
| commit | 48b72481dba08c5185c1dd6a70b82b326be43d6b (patch) | |
| tree | bfa4f047c73b138c59732a37297737fa1ffd3e91 /sys/compat/linuxkpi/common/include/linux/compiler.h | |
| parent | f8c5cd12c37a92500da3f42f1d25bae9cc70e30a (diff) | |
| parent | c0ae58548ada98f553239a091b8764ea9e1b474b (diff) | |
| download | FreeBSD-src-48b72481dba08c5185c1dd6a70b82b326be43d6b.zip FreeBSD-src-48b72481dba08c5185c1dd6a70b82b326be43d6b.tar.gz | |
MFhead @ r292618
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_ */ |
