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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-06-30 15:23:59 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-06-30 15:23:59 +1000 |
| commit | 6da49a292534d31ca391928ea97f8225774dc1e0 (patch) | |
| tree | 060c5f5f40dceb10d4528763bc7fc1ccc88210d9 /include/linux/percpu.h | |
| parent | 17bdc6c0e979ae61879806e4dd93ec3b169d0931 (diff) | |
| parent | ca56a95eedcc95f8fea7b49c87565cd961d74fe2 (diff) | |
Merge remote branch 'origin/master' into next
Diffstat (limited to 'include/linux/percpu.h')
| -rw-r--r-- | include/linux/percpu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 8b97308e65df..9ca008f0c542 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -259,6 +259,9 @@ extern void __bad_size_call_parameter(void); * Special handling for cmpxchg_double. cmpxchg_double is passed two * percpu variables. The first has to be aligned to a double word * boundary and the second has to follow directly thereafter. + * We enforce this on all architectures even if they don't support + * a double cmpxchg instruction, since it's a cheap requirement, and it + * avoids breaking the requirement for architectures with the instruction. */ #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ ({ \ |