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ARC: IO: add volatile to accessors

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We must use 'volatile' in C-version read/write IO accessors
implementation to avoid merging several reads (writes) into
one read (write), or optimizing them out by compiler.

Fixes commit 07906b3dad ("ARC: Switch to generic accessors")

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Eugeniy Paltsev 2020-03-30 22:44:43 +03:00 committed by Alexey Brodkin
parent 93330d4ce4
commit 7e57022823
1 changed files with 14 additions and 8 deletions
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22
arch/arc/include/asm/io.h
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@ -54,15 +54,21 @@ static inline void sync(void)
/* Not yet implemented */ /* Not yet implemented */
} }
#define __arch_getb(a) (*(unsigned char *)(a)) /*
#define __arch_getw(a) (*(unsigned short *)(a)) * We must use 'volatile' in C-version read/write IO accessors implementation
#define __arch_getl(a) (*(unsigned int *)(a)) * to avoid merging several reads (writes) into one read (write), or optimizing
#define __arch_getq(a) (*(unsigned long long *)(a)) * them out by compiler.
*/
#define __arch_getb(a) (*(volatile u8 *)(a))
#define __arch_getw(a) (*(volatile u16 *)(a))
#define __arch_getl(a) (*(volatile u32 *)(a))
#define __arch_getq(a) (*(volatile u64 *)(a))
#define __arch_putb(v, a) (*(volatile u8 *)(a) = (v))
#define __arch_putw(v, a) (*(volatile u16 *)(a) = (v))
#define __arch_putl(v, a) (*(volatile u32 *)(a) = (v))
#define __arch_putq(v, a) (*(volatile u64 *)(a) = (v))
#define __arch_putb(v, a) (*(unsigned char *)(a) = (v))
#define __arch_putw(v, a) (*(unsigned short *)(a) = (v))
#define __arch_putl(v, a) (*(unsigned int *)(a) = (v))
#define __arch_putq(v, a) (*(unsigned long long *)(a) = (v))
#define __raw_writeb(v, a) __arch_putb(v, a) #define __raw_writeb(v, a) __arch_putb(v, a)
#define __raw_writew(v, a) __arch_putw(v, a) #define __raw_writew(v, a) __arch_putw(v, a)