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Date: Wed, 6 Mar 2019 17:12:58 +0000 From: Paul Burton <paul.burton@...s.com> To: Steven Price <steven.price@....com> CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, Andy Lutomirski <luto@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>, Catalin Marinas <catalin.marinas@....com>, Dave Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, James Morse <james.morse@....com>, Jérôme Glisse <jglisse@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will.deacon@....com>, "x86@...nel.org" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Mark Rutland <Mark.Rutland@....com>, "Liang, Kan" <kan.liang@...ux.intel.com>, Ralf Baechle <ralf@...ux-mips.org>, James Hogan <jhogan@...nel.org>, "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org> Subject: Re: [PATCH v4 03/19] mips: mm: Add p?d_large() definitions Hi Steven, On Wed, Mar 06, 2019 at 03:50:15PM +0000, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_large() functions/macros. > > For mips, we only support large pages on 64 bit. > > For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not > defined we can be confident that there are no large pages in existence > and fall back on the generic implementation (added in a later patch) > which returns 0. > > CC: Ralf Baechle <ralf@...ux-mips.org> > CC: Paul Burton <paul.burton@...s.com> > CC: James Hogan <jhogan@...nel.org> > CC: linux-mips@...r.kernel.org > Signed-off-by: Steven Price <steven.price@....com> Acked-by: Paul Burton <paul.burton@...s.com> Thanks, Paul
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