>>>>> "Andrew" == Andrew Morton <[EMAIL PROTECTED]> writes:
Andrew> Jes Sorensen <[EMAIL PROTECTED]> wrote: >> Convert /dev/mem read/write calls to use arch_translate_mem_ptr if >> available. Needed on ia64 for pages converted fo uncached mappings >> to avoid it being accessed in cached mode after the conversion >> which can lead to memory corruption. Introduces PG_uncached page >> flag for marking pages uncached. Andrew> For some reason this patch still gives me the creeps. Maybe Andrew> it's because we lose a page flag for something so obscure. Andrew> Nothing ever clears PG_uncached. We'll end up with every page Andrew> in the machine marked as being uncached. Actually there's restrictions to how many pages are getting converted as converting pages over from cached to uncached isn't trivial on ia64. Andrew> But then, nothing ever sets PG_uncached, either. Is there Andrew> some patch which you're hiding from me? Actually I posted that earlier, but it must have gotten lost in the noise. It's part of the genalloc/mspec patchset. I'll send it to you directly. Andrew> If a page is marked uncached then it'll remain marked as Andrew> uncached even after it's unmapped. Or will it? Would like to Andrew> see the other patch, please. Coming your way in a jiffy. Andrew> We should add PG_uncached checks to the page allocator. Is Andrew> this OK? I don't see any problems with that. The way it's meant to be used is that once pages are converted over, they don't go back into the allocator. Cheers, Jes - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
