From ee47c4cb2b3413b3ee0edd2207de46d715b2628c Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Mon, 28 Nov 2016 00:15:13 +0200 Subject: sh4: cache: correct dcache flush to invalidate with write-back In common usecases flush_cache() assumes both cache invalidation and write-back to memory, thus in flush_dcache_range() implementation change SH4 cache write-back only instruction 'ocbwb' with cache purge instruction 'ocbp', according to the User's Manual there should be no performance penalty for that. Note that under circumstances only cache invalidation is expected from flush_cache() call, in these occasional cases the current version of flush_cache() works, which is a wrapper over invalidate_dcache_range() at the moment, this will be fixed in the following change. Signed-off-by: Vladimir Zapolskiy --- arch/sh/cpu/sh4/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/sh') diff --git a/arch/sh/cpu/sh4/cache.c b/arch/sh/cpu/sh4/cache.c index e1ee970a91..b3e5fd5595 100644 --- a/arch/sh/cpu/sh4/cache.c +++ b/arch/sh/cpu/sh4/cache.c @@ -97,7 +97,7 @@ void flush_dcache_range(unsigned long start, unsigned long end) start &= ~(L1_CACHE_BYTES - 1); for (v = start; v < end; v += L1_CACHE_BYTES) { - asm volatile ("ocbwb %0" : /* no output */ + asm volatile ("ocbp %0" : /* no output */ : "m" (__m(v))); } } -- cgit v1.2.3