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Re: highmem and cache handling | |
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Hi Vladimir... On Wed, Mar 28, 2012 at 19:30, Vladimir Murzin <murzin.v@xxxxxxxxx> wrote: > Hello everyone! > > I can see across the Linux kernel source code that some > kmap*()/kunmap*() pairs are coupled with flush_dcache_page(). > Sometimes it is done outside kmap*()/kunmap() pairs, sometimes inside... > I'm curious is there any rule how it should be done correctly or it > should be handled case by case? Never "read" such "rule", but IMHO to be sure TLB really cache the new mapping, flush_dcache_page() logically should be done before kmap(). But I think it's platform dependent.... not sure though.... -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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