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x86, atomic: atomic64_read() take a const pointer

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atomic64_read() doesn't actually write anything (as far as the C
environment is concerned... the CPU does actually write but that's an
implementation quirk), so it should take a const pointer.

This does NOT mean that it is safe to use atomic64_read() on an object
in readonly storage (it will trap!)

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/20120109165859.1879abda.akpm@linux-foundation.org
This commit is contained in:
H. Peter Anvin 2012-01-09 19:33:24 -08:00
parent da517a08ac
commit 8030c36d13
1 changed files with 1 additions and 1 deletions
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arch/x86/include/asm/atomic64_32.h
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@ -82,7 +82,7 @@ static inline void atomic64_set(atomic64_t *v, long long i)
*
* Atomically reads the value of @v and returns it.
*/
static inline long long atomic64_read(atomic64_t *v)
static inline long long atomic64_read(const atomic64_t *v)
{
long long r;
asm volatile(ATOMIC64_ALTERNATIVE(read)