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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
This commit is contained in:
Paul Burton 2019-10-01 21:53:13 +00:00
parent 5c12a6eff6
commit fe0065e562
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GPG Key ID: 3EA79FACB57500DD
1 changed files with 4 additions and 14 deletions
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18
arch/mips/include/asm/barrier.h
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@ -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)
{