Messages in this thread | | | Date | Tue, 21 Jul 2015 10:05:44 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces |
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* Toshi Kani <toshi.kani@hp.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
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