Unverified Commit fe0065e5 authored Oct 01, 2019 by Paul Burton

MIPS: barrier: Clean up __sync() definition



Implement __sync() using the new __SYNC() infrastructure, which will
take care of not emitting an instruction for old R3k CPUs that don't
support it. The only behavioral difference is that __sync() will now
provide a compiler barrier on these old CPUs, but that seems like
reasonable behavior anyway.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org

parent 5c12a6ef

arch/mips/include/asm/barrier.h

+4 −14

Original line number	Diff line number	Diff line
		@@ -11,20 +11,10 @@
		#include <asm/addrspace.h>
		#include <asm/sync.h>

		#ifdef CONFIG_CPU_HAS_SYNC
		#define __sync() \
		__asm__ __volatile__( \
		".set push\n\t" \
		".set noreorder\n\t" \
		".set mips2\n\t" \
		"sync\n\t" \
		".set pop" \
		: /* no output */ \
		: /* no input */ \
		: "memory")
		#else
		#define __sync() do { } while(0)
		#endif
		static inline void __sync(void)
		{
		asm volatile(__SYNC(full, always) ::: "memory");
		}

		static inline void rmb(void)
		{

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