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Date: Fri, 01 Feb 2008 11:16:02 -0800 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Andi Kleen <ak@...e.de> CC: tglx@...utronix.de, mingo@...e.hu, linux-kernel@...r.kernel.org Subject: Re: [PATCH] [12/12] GBPAGES: Switch direct mapping setup over to set_pte Andi Kleen wrote: >> Why? 64-bit Xen will need this to be set_pmd if its an update to L2 of >> the table. >> > > Then change_page_attr() and hugepages will already not work because they both > do exactly that. > > And I didn't want to duplicate this manual code for the GBpages case, so i > changed it everywhere to the standard way. It's a bit moot because Xen doesn't support any kind of large page yet, but there has been some work in that area. The main problem with using set_pte is that Xen supports trap'n'emulate for pte-level accesses, but not for upper levels. Looks like you're right about the rest of cpa; may as well make it all consistent for now, and we can fix it later when the need arises. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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