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arm64: percpu: kill off final ACCESS_ONCE() uses

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For several reasons it is preferable to use {READ,WRITE}_ONCE() rather than
ACCESS_ONCE(). For example, these handle aggregate types, result in shorter
source code, and better document the intended access (which may be useful for
instrumentation features such as the upcoming KTSAN).

Over a number of patches, most uses of ACCESS_ONCE() in arch/arm64 have been
migrated to {READ,WRITE}_ONCE(). For consistency, and the above reasons, this
patch migrates the final remaining uses.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland 2016-11-04 18:17:06 +00:00 committed by Catalin Marinas
parent 0c2f0afe35
commit 094339443e
1 changed files with 8 additions and 8 deletions
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16
arch/arm64/include/asm/percpu.h
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@ -101,16 +101,16 @@ static inline unsigned long __percpu_read(void *ptr, int size)
switch (size) {
case 1:
ret = ACCESS_ONCE(*(u8 *)ptr);
ret = READ_ONCE(*(u8 *)ptr);
break;
case 2:
ret = ACCESS_ONCE(*(u16 *)ptr);
ret = READ_ONCE(*(u16 *)ptr);
break;
case 4:
ret = ACCESS_ONCE(*(u32 *)ptr);
ret = READ_ONCE(*(u32 *)ptr);
break;
case 8:
ret = ACCESS_ONCE(*(u64 *)ptr);
ret = READ_ONCE(*(u64 *)ptr);
break;
default:
BUILD_BUG();
@ -123,16 +123,16 @@ static inline void __percpu_write(void *ptr, unsigned long val, int size)
{
switch (size) {
case 1:
ACCESS_ONCE(*(u8 *)ptr) = (u8)val;
WRITE_ONCE(*(u8 *)ptr, (u8)val);
break;
case 2:
ACCESS_ONCE(*(u16 *)ptr) = (u16)val;
WRITE_ONCE(*(u16 *)ptr, (u16)val);
break;
case 4:
ACCESS_ONCE(*(u32 *)ptr) = (u32)val;
WRITE_ONCE(*(u32 *)ptr, (u32)val);
break;
case 8:
ACCESS_ONCE(*(u64 *)ptr) = (u64)val;
WRITE_ONCE(*(u64 *)ptr, (u64)val);
break;
default:
BUILD_BUG();