Messages in this thread |  | | Date | Mon, 3 Sep 2001 13:14:36 -0700 | From | Richard Henderson <> | Subject | Re: [PATCH] avoid unnecessary cache flushes |
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On Fri, Aug 31, 2001 at 09:18:50PM +1000, Paul Mackerras wrote: > + if (!test_bit(PG_arch_1, &page->flags)) { > + __flush_dcache_icache((unsigned long)kmap(page)); > + kunmap(page); > + set_bit(PG_arch_1, &page->flags);
Race. Use test_and_set_bit.
As for Alpha, all we have is "flush entire icache", so there's not much interesting we can do by way of optimization I don't think.
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