diff options
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index c8bd2daf95ec..8322141ee480 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h | |||
| @@ -190,7 +190,9 @@ extern void __chk_io_ptr(const volatile void __iomem *); | |||
| 190 | * ACCESS_ONCE() in different C statements. | 190 | * ACCESS_ONCE() in different C statements. |
| 191 | * | 191 | * |
| 192 | * This macro does absolutely -nothing- to prevent the CPU from reordering, | 192 | * This macro does absolutely -nothing- to prevent the CPU from reordering, |
| 193 | * merging, or refetching absolutely anything at any time. | 193 | * merging, or refetching absolutely anything at any time. Its main intended |
| 194 | * use is to mediate communication between process-level code and irq/NMI | ||
| 195 | * handlers, all running on the same CPU. | ||
| 194 | */ | 196 | */ |
| 195 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | 197 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |
| 196 | 198 | ||