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Tue, 08 Feb 2022 00:24:17 -0800 (PST) Date: Tue, 8 Feb 2022 01:24:13 -0700 From: Yu Zhao To: Andrew Morton , Johannes Weiner , Mel Gorman , Michal Hocko Cc: Andi Kleen , Aneesh Kumar , Barry Song <21cnbao@gmail.com>, Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Jesse Barnes , Jonathan Corbet , Linus Torvalds , Matthew Wilcox , Michael Larabel , Mike Rapoport , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, page-reclaim@google.com, x86@kernel.org, Brian Geffon , Jan Alexander Steffens , Oleksandr Natalenko , Steven Barrett , Suleiman Souhlal , Daniel Byrne , Donald Carr , Holger =?iso-8859-1?Q?Hoffst=E4tte?= , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh Subject: Re: [PATCH v7 01/12] mm: x86, arm64: add arch_has_hw_pte_young() Message-ID: References: <20220208081902.3550911-1-yuzhao@google.com> <20220208081902.3550911-2-yuzhao@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220208081902.3550911-2-yuzhao@google.com> X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: aofycez6btkgw4gekf5esxod71igcb6w Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=EQfrfLZx; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf27.hostedemail.com: domain of yuzhao@google.com designates 209.85.166.54 as permitted sender) smtp.mailfrom=yuzhao@google.com X-Rspamd-Queue-Id: 0D45040002 X-HE-Tag: 1644308658-433594 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Feb 08, 2022 at 01:18:51AM -0700, Yu Zhao wrote: > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index c4ba047a82d2..990358eca359 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -999,23 +999,13 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, > * page after fork() + CoW for pfn mappings. We don't always have a > * hardware-managed access flag on arm64. > */ > -static inline bool arch_faults_on_old_pte(void) > -{ > - WARN_ON(preemptible()); > - > - return !cpu_has_hw_af(); > -} > -#define arch_faults_on_old_pte arch_faults_on_old_pte > +#define arch_has_hw_pte_young cpu_has_hw_af Reworked arch_has_hw_pte_young() for arm64 according to: https://lore.kernel.org/linux-mm/20220111141901.GA10338@willie-the-truck/