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Miller" , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, Alexandre Ghiti , Albert Ou , WANG Xuerui , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Subject: Re: [PATCH v3 1/5] mm/sparse-vmemmap: provide generic vmemmap_set_pmd() and vmemmap_check_pmd() Message-ID: References: <20260601084845.3792171-1-songmuchun@bytedance.com> <20260601084845.3792171-2-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260601084845.3792171-2-songmuchun@bytedance.com> X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 9EDC9C0004 X-Stat-Signature: tmcrffk1omz71u31rep48na97xqq9job X-Rspam-User: X-HE-Tag: 1780375283-985723 X-HE-Meta: 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 3Br9f25G qRa9lcxvK0Pv8WrioVsxF+ld5xXW0CMhi4+FoNtg65efzLguTy1aE20dDT73Av4h8KJCml0my5SQFZJHjX4LPq5ojZrWECxEJS6iWPe+2Op/sdttY9PxO4i+gkfOL/CG2YEYDwB0N9PdEEvSvvxZZMDZ07Z7dpF///B/5ca8OSsOwS8IWAuAlFKvOI1G8QrGr76GzBTHP52yesG7hds9xtxnK1vOhu04moEkaRXpur4/d+/M0E2lWjmvvdChmpZDL9D4DppVZLAPx9b0//fxJibBz3v9mOTXq1DOTfzZSqxz2QCT1TjuHM2EZ7w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jun 01, 2026 at 04:48:40PM +0800, Muchun Song wrote: > The two weak functions are currently no-ops on every architecture, > forcing each platform that needs them to duplicate the same handful > of lines. Provide a generic implementation: > > - vmemmap_set_pmd() simply sets a huge PMD with PAGE_KERNEL protection. > > - vmemmap_check_pmd() verifies that the PMD is present and leaf, > then calls the existing vmemmap_verify() helper. > > Architectures that need special handling can continue to override the > weak symbols; everyone else gets the standard version for free. > > Signed-off-by: Muchun Song Acked-by: Oscar Salvador (SUSE) -- Oscar Salvador SUSE Labs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C0970CD6E4A for ; Tue, 2 Jun 2026 04:41:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=38L4S3KP9HUqoT1rw9V5A0WWdBvhmGsBgCdVXWcaAlE=; b=BAy+CbIZHag0kL wPd216C81ip7U7Zl/7D60C+Xjcdyt0dEMWL/ruuKlJJUwJhcNLrLFkIwuungBVhotdT40lsFJsTla xAlHMc7qtyCIVDLr5tScmGLVRL4a+jJFWnzXr/HwqoZfRZhAlpmqSFHQlEFm/cUDnaFtLApCK7hIB UA6DYNyoX+KwAMjpazL1OxD9jtWQgV7zF/r7DCsKL6n6qQtNt+hMa6UcXei376SBonSOwZ7AjDR1Q QWUlFHKfcJubanKN3dtDgvyL4hcwfXv2AijAr3vJdYaV/2RpedSy4haIFX0VCjyz9rTu93vG9YX2l foFw+4bhQv5imn9IbUEg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wUGwQ-0000000CHh9-2WnL; Tue, 02 Jun 2026 04:41:26 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wUGwN-0000000CHg2-370o; Tue, 02 Jun 2026 04:41:24 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id E6D4E42A7B; Tue, 2 Jun 2026 04:41:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 227081F00893; Tue, 2 Jun 2026 04:41:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780375282; bh=5iTAXR5bbzIxHxlJbNzCQ0CqrWCPbLprw+Rivi0AdWo=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=fVVCf76Dx7vvRtOjppgGy1UPYStuohI+uy9DWtC+LjMgaEMLbdvFewnh94OAL+CM2 pCOKO3Nnfhfp4QVVVFHJ7pGlC0pcRPQSBoK+8qI+lMS8vE1L9za9TMoAEhapGCyg9z oSOX6UXAQ0qI8lZdcWzGnsDHIE/3SlXVTvbbZnLLGgJsb+q9w7gAY3CfUe/oXsaq3F IKCnC0jDUA164OuR9mISVXoVORX5ONpBDuDwwi+L6+sBtk7/0MupCBLirVc0R3mesL YLqI48YwygT3VSDU6XtM8NAwITqzxDNVTMAKliil4c0o+GhGmZTerIkNtW6sdsl3Fh evYO5/MHJ+rmg== Date: Tue, 2 Jun 2026 06:41:14 +0200 From: "Oscar Salvador (SUSE)" To: Muchun Song Cc: Andrew Morton , David Hildenbrand , Catalin Marinas , Will Deacon , Palmer Dabbelt , Paul Walmsley , Huacai Chen , Andreas Larsson , "David S. Miller" , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, Alexandre Ghiti , Albert Ou , WANG Xuerui , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Subject: Re: [PATCH v3 1/5] mm/sparse-vmemmap: provide generic vmemmap_set_pmd() and vmemmap_check_pmd() Message-ID: References: <20260601084845.3792171-1-songmuchun@bytedance.com> <20260601084845.3792171-2-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260601084845.3792171-2-songmuchun@bytedance.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260601_214123_802706_A60FF950 X-CRM114-Status: GOOD ( 10.30 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, Jun 01, 2026 at 04:48:40PM +0800, Muchun Song wrote: > The two weak functions are currently no-ops on every architecture, > forcing each platform that needs them to duplicate the same handful > of lines. Provide a generic implementation: > > - vmemmap_set_pmd() simply sets a huge PMD with PAGE_KERNEL protection. > > - vmemmap_check_pmd() verifies that the PMD is present and leaf, > then calls the existing vmemmap_verify() helper. > > Architectures that need special handling can continue to override the > weak symbols; everyone else gets the standard version for free. > > Signed-off-by: Muchun Song Acked-by: Oscar Salvador (SUSE) -- Oscar Salvador SUSE Labs _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv