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| author | Ingo Molnar <mingo@elte.hu> | 2008-10-13 10:52:30 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-13 10:52:30 +0200 |
| commit | c493756e2a8a78bcaae30668317890dcfe86e7c3 (patch) | |
| tree | 8fb40782e79472ed882ff2098d4dd295557278ee /include/linux/compiler.h | |
| parent | 0d15504f16f68725e4635aa85411015d1c573b0a (diff) | |
| parent | 4480f15b3306f43bbb0310d461142b4e897ca45b (diff) | |
Merge branch 'linus' into oprofile
Conflicts:
arch/x86/kernel/apic_32.c
include/linux/pci_ids.h
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 *); * ACCESS_ONCE() in different C statements. * * This macro does absolutely -nothing- to prevent the CPU from reordering, - * merging, or refetching absolutely anything at any time. + * merging, or refetching absolutely anything at any time. Its main intended + * use is to mediate communication between process-level code and irq/NMI + * handlers, all running on the same CPU. */ #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |