[Xen-devel] [PATCH 8/8] kernel: Fix sparse warning for ACCESS_ONCE

[Christian Borntraeger <borntraeger@xxxxxxxxxx>]

Commit a91ed664749c ("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: a91ed664749c ("kernel: tighten rules for ACCESS ONCE")
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
 include/linux/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 5e186bf..7bebf05 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -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))
 
-- 
1.9.3


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