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Date: Tue, 15 Mar 2016 23:24:22 +0100 From: "Luis R. Rodriguez" <mcgrof@...nel.org> To: Ingo Molnar <mingo@...nel.org> Cc: "Luis R. Rodriguez" <mcgrof@...nel.org>, paulmck@...ux.vnet.ibm.com, bp@...en8.de, tglx@...utronix.de, hpa@...or.com, toshi.kani@...com, airlied@...hat.com, benh@...nel.crashing.org, mst@...hat.com, vinod.koul@...el.com, jgross@...e.com, daniel.vetter@...ll.ch, luto@...capital.net, davem@...emloft.net, ben@...adent.org.uk, benjamin.poirier@...il.com, linux-fbdev@...r.kernel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org, linux-doc@...r.kernel.org, corbet@....net Subject: Re: [PATCH v2] x86: PAT: Documentation: rewrite "MTRR effects on PAT / non-PAT systems" On Sat, Mar 05, 2016 at 12:52:55PM +0100, Ingo Molnar wrote: > > * Luis R. Rodriguez <mcgrof@...nel.org> wrote: > > > The current documentation refers to using set_memory_wc() as a > > possible hole strategy when you have overlapping ioremap() regions, > > The whole explanation should talk about virtual aliases over the same physical > address, not some 'overlapping regions'. > > I see where this talk about 'overlap' comes: the memtype rbtree in > arch/x86/mm/pat_rbtree.c indeed has memtype ranges that may overlap on the > physical side. But it is highly confusing to call this 'overlapping' on the driver > API documentation level without making it really clear what it's about. Alright thanks, I think I'll just stick to aliasing. I'll go over the threads and pick out only what is relevant. Luis
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