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alpha: io: implement relaxed accessor macros for writes

write{b,w,l,q}_relaxed are implemented by some architectures in order to
permit memory-mapped I/O writes with weaker barrier semantics than the
non-relaxed variants.

This patch implements these write macros for Alpha, in the same vein as
the relaxed read macros, which are already implemented.

Acked-by: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Will Deacon and committed by
Linus Torvalds 9e36c633 5691e445

+8 -4
+8 -4
arch/alpha/include/asm/io.h
··· 500 500 #define outb_p outb 501 501 #define outw_p outw 502 502 #define outl_p outl 503 - #define readb_relaxed(addr) __raw_readb(addr) 504 - #define readw_relaxed(addr) __raw_readw(addr) 505 - #define readl_relaxed(addr) __raw_readl(addr) 506 - #define readq_relaxed(addr) __raw_readq(addr) 503 + #define readb_relaxed(addr) __raw_readb(addr) 504 + #define readw_relaxed(addr) __raw_readw(addr) 505 + #define readl_relaxed(addr) __raw_readl(addr) 506 + #define readq_relaxed(addr) __raw_readq(addr) 507 + #define writeb_relaxed(b, addr) __raw_writeb(b, addr) 508 + #define writew_relaxed(b, addr) __raw_writew(b, addr) 509 + #define writel_relaxed(b, addr) __raw_writel(b, addr) 510 + #define writeq_relaxed(b, addr) __raw_writeq(b, addr) 507 511 508 512 #define mmiowb() 509 513