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kernel: Fix sparse warning for ACCESS_ONCE

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Commit 927609d622 ("kernel: tighten rules for ACCESS ONCE") results in
sparse warnings like "Using plain integer as NULL pointer" - Let's add a
type cast to the dummy assignment.
To avoid warnings lik "sparse: warning: cast to restricted __hc32" we also
use __force on that cast.

Fixes: 927609d622 ("kernel: tighten rules for ACCESS ONCE")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2015-01-12 12:13:39 +01:00
parent 378af02b1a
commit c5b19946eb
1 changed files with 1 additions and 1 deletions
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2
include/linux/compiler.h
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@ -461,7 +461,7 @@ static __always_inline void __assign_once_size(volatile void *p, void *res, int
* If possible use READ_ONCE/ASSIGN_ONCE instead.
*/
#define __ACCESS_ONCE(x) ({ \
__maybe_unused typeof(x) __var = 0; \
__maybe_unused typeof(x) __var = (__force typeof(x)) 0; \
(volatile typeof(x) *)&(x); })
#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x))