Commit 9e36c633 authored Jul 24, 2014 by Will Deacon Committed by Linus Torvalds Aug 29, 2014

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>

parent 5691e445

arch/alpha/include/asm/io.h

+8 −4

Original line number	Diff line number	Diff line
		@@ -504,6 +504,10 @@ extern inline void writeq(u64 b, volatile void __iomem *addr)
		#define readw_relaxed(addr) __raw_readw(addr)
		#define readl_relaxed(addr) __raw_readl(addr)
		#define readq_relaxed(addr) __raw_readq(addr)
		#define writeb_relaxed(b, addr) __raw_writeb(b, addr)
		#define writew_relaxed(b, addr) __raw_writew(b, addr)
		#define writel_relaxed(b, addr) __raw_writel(b, addr)
		#define writeq_relaxed(b, addr) __raw_writeq(b, addr)

		#define mmiowb()