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Message-ID: <20150721080544.GA28118@gmail.com> Date: Tue, 21 Jul 2015 10:05:44 +0200 From: Ingo Molnar <mingo@...nel.org> To: Toshi Kani <toshi.kani@...com> Cc: hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, akpm@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com, konrad.wilk@...cle.com, elliott@...com Subject: Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces * Toshi Kani <toshi.kani@...com> wrote: > The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used. > This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently > used for masking pfn and flags for all cases. > > Patch 1/4-2/4 make changes necessary for patch 3/4 to use P?D_PAGE_MASK. > > Patch 3/4 fixes pud/pmd interfaces to handle the PAT bit when PUD and PMD > mappings are used. > > Patch 3/4 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit > properly. > > Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings. Are patches 1-3 only needed to fix /sys/kernel/debug/kernel_page_tables output, or are there other things fixed as well? The patches do not tell us any of that information ... Thanks, Ingo -- 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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