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compiler.h: Enforce that READ_ONCE_NOCHECK() access size is sizeof(long) 

READ_ONCE_NOCHECK() unconditionally performs a sizeof(long)-sized access,
so enforce that the size of the pointed-to object that we are loading
from is the same size as 'long'.

Reported-by: Marco Elver <elver@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-06-05 11:19:46 +01:00
parent 8d4beed7bb
commit b16d8ecf4f
1 changed files with 5 additions and 2 deletions
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7
include/linux/compiler.h
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@ -254,9 +254,12 @@ unsigned long __read_once_word_nocheck(const void *addr)
*/ */
#define READ_ONCE_NOCHECK(x) \ #define READ_ONCE_NOCHECK(x) \
({ \ ({ \
unsigned long __x = __read_once_word_nocheck(&(x)); \ unsigned long __x; \
compiletime_assert(sizeof(x) == sizeof(__x), \
"Unsupported access size for READ_ONCE_NOCHECK()."); \
__x = __read_once_word_nocheck(&(x)); \
smp_read_barrier_depends(); \ smp_read_barrier_depends(); \
__x; \ (typeof(x))__x; \
}) })
static __no_kasan_or_inline static __no_kasan_or_inline