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Date: Wed, 1 Nov 2017 01:01:45 -0700 From: Andy Lutomirski <luto@...nel.org> To: Dave Hansen <dave.hansen@...ux.intel.com> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at, michael.schwarz@...k.tugraz.at, Andrew Lutomirski <luto@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...gle.com>, Hugh Dickins <hughd@...gle.com>, X86 ML <x86@...nel.org> Subject: Re: [PATCH 04/23] x86, tlb: make CR4-based TLB flushes more robust On Tue, Oct 31, 2017 at 3:31 PM, Dave Hansen <dave.hansen@...ux.intel.com> wrote: > > Our CR4-based TLB flush currently requries global pages to be > supported *and* enabled. But, we really only need for them to be > supported. Make the code more robust by alllowing X86_CR4_PGE to > clear as well as set. > > This change was suggested by Kirill Shutemov. I may have missed something, but why would be ever have CR4.PGE off?
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