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b=JDHYLNBZtzPaNXVho2kDaLiARfyfnqFPnf9nfQ6EhFuKJtSRiOUtDhjFgeY/WYmAn 2YcV9Ima4gdxz6cuzyeN28w4y8xpgk+5Ly7cWdY/OlR5ff6W4eurh8O+6DXGuBSCTW S2j+eMw/HHoN8UL7L718UMmeUmCy2S1K6SNGIqjFwGOUwxvFrVtIZFe8DJ2URkyBhZ Tb92uq2SfYTN5KbWc24raM66iJwD5mL5Ozm4oD0p0h/1rzNSg62ZSWCLuf2SZM+3FT 4Rf8uDV0VWwRxE0K2MzM9oTB1Qk0vatyWHOVZX3p8H2Pd1dWTH1NsaUfAqBYnjUKXv 7/Y3vSsYDIfPQ== Message-ID: <79a1f2dd-6752-426c-84c1-a38d300eb78c@kernel.org> Date: Mon, 3 Nov 2025 15:41:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/huge_memory: Initialise the tags of the huge zero folio To: Catalin Marinas , Mark Brown Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, Andrew Morton , Will Deacon , Aishwarya.TCV@arm.com References: <20251031170133.280742-1-catalin.marinas@arm.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: DF351C0003 X-Stat-Signature: kxg5igxpf7r3roqbot4e6rh9shoaawdd X-Rspam-User: X-HE-Tag: 1762180868-116457 X-HE-Meta: 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 3rkKYmh+ 6r3vo4FxOphTr8OBHm8xa/3PDIiqNmuCvDHx2Cn5Wmb7VsczMPGdPhHlEXq8uBjunzWx8an7UT2vLlgJWofOqC4lHaXA3BnnIm9WBuHkk5XX+7nHHyMecMvDZJ0a6+5KRETI2O/+1DX6rRIDj/VvEmWRd/SRWBHLDgMy4uXFvUlK+vmEAEOPW3v4ZXBU114Sy3BZU0W0cjHFcx9cmGmbFwiJh23iwdLjgpSxYVtGRgbzfV6wprMaTtUUrsLKfguCkgaGAMerSFHWBweOSGyCmVxHyeGnKRkeREzUPfxAI7PSzHvSbdbF35X8Zgw== 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: List-Subscribe: List-Unsubscribe: > > -----------8<--------------------------------------------- > diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c > index d816ff44faff..125dfa6c613b 100644 > --- a/arch/arm64/mm/fault.c > +++ b/arch/arm64/mm/fault.c > @@ -969,6 +969,16 @@ struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma, > > void tag_clear_highpage(struct page *page) > { > + /* > + * Check if MTE is supported and fall back to clear_highpage(). > + * get_huge_zero_folio() unconditionally passes __GFP_ZEROTAGS and > + * post_alloc_hook() will invoke tag_clear_highpage(). > + */ > + if (!system_supports_mte()) { > + clear_highpage(page); > + return; > + } > + LGTM! -- Cheers David