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kernel: make READ_ONCE() valid on const arguments

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The use of READ_ONCE() causes lots of warnings witht he pending paravirt
spinlock fixes, because those ends up having passing a member to a
'const' structure to READ_ONCE().

There should certainly be nothing wrong with using READ_ONCE() with a
const source, but the helper function __read_once_size() would cause
warnings because it would drop the 'const' qualifier, but also because
the destination would be marked 'const' too due to the use of 'typeof'.

Use a union of types in READ_ONCE() to avoid this issue.

Also make sure to use parenthesis around the macro arguments to avoid
possible operator precedence issues.

Tested-by: Ingo Molnar <mingo@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2015-02-20 15:46:31 -08:00
parent 4fbd0a81a0
commit dd36929720
1 changed files with 3 additions and 3 deletions
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6
include/linux/compiler.h
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@ -202,7 +202,7 @@ static __always_inline void data_access_exceeds_word_size(void)
{
}
static __always_inline void __read_once_size(volatile void *p, void *res, int size)
static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
{
switch (size) {
case 1: *(__u8 *)res = *(volatile __u8 *)p; break;
@ -259,10 +259,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
*/
#define READ_ONCE(x) \
({ typeof(x) __val; __read_once_size(&x, &__val, sizeof(__val)); __val; })
({ union { typeof(x) __val; char __c[1]; } __u; __read_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
#define WRITE_ONCE(x, val) \
({ typeof(x) __val; __val = val; __write_once_size(&x, &__val, sizeof(__val)); __val; })
({ typeof(x) __val = (val); __write_once_size(&(x), &__val, sizeof(__val)); __val; })
#endif /* __KERNEL__ */