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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5CE8110A1E63 for ; Thu, 26 Mar 2026 10:44:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BF6AA6B013A; Thu, 26 Mar 2026 06:44:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BCED66B013B; Thu, 26 Mar 2026 06:44:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B0B0E6B013C; Thu, 26 Mar 2026 06:44:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 9FE626B013A for ; Thu, 26 Mar 2026 06:44:58 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 537755C45D for ; Thu, 26 Mar 2026 10:44:58 +0000 (UTC) X-FDA: 84587881476.09.E7F0DB1 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf07.hostedemail.com (Postfix) with ESMTP id AA1004000F for ; Thu, 26 Mar 2026 10:44:56 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=oZaElY+x; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf07.hostedemail.com: domain of vbabka@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=vbabka@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774521896; a=rsa-sha256; cv=none; b=Wh7AW4CUpX7w6tQorz4ddEBtewDrTx3KMb+wy/w6wx3Rg9fXEJVjNBHYQR4rOP9lzz1yjg TDzkSHsWX5SuENTiv6MG1GZh6HR/xurOXjfGGGCPamR96w9uGGTzHvxEtODs8t6LdYk3ny VbP62jQulwbFui4cMveX4oCvrDmuC9M= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=oZaElY+x; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf07.hostedemail.com: domain of vbabka@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=vbabka@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774521896; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Bo2WuRtmRS8Z86c0o/7IVvpIgFBSmwSYlo7KDlda+NI=; b=YdqeuqabZtzMj2SANoBwCFWo4e5g1hpiPJtQeEl1ZUMMuriTNM9vuzg7W8G6pLqE/TECgm UXAOD5nCg3tgCYA6iOCqLuKjT+vLIHIDn2dD2EC5oMkiG+HBvaqJh3bfqx11JzkInMF0qs B+pVzW0ojHotkLhi8WoCkmzCzqIujpo= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 21E9D60103; Thu, 26 Mar 2026 10:44:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE3B6C116C6; Thu, 26 Mar 2026 10:44:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774521895; bh=RpHr2+xHkvht2/Kh3sSH7GYvx2wP6yqls3YE2NUO0rs=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=oZaElY+xwfixyAcqHZhLjm1kzqhHtlPlUH7GKOTLKXANwHDqMaG1z6XwK+kEQeLOE SYtBHHg37QOb54eq+UD8GrKX9hQ+eyixSzkh57jRU/1t5ChhlFDoLNFrhlvAUfv7T6 sZWCKLLb7jN89LctiPPnWlgN5y78Qjx+/QHgsyWC0CQN+IMFUPMFgtvHlpiyUt+V5w LeoibiKN4Zw4L9hawiOfwt1apacVFOXRxXyuXI0ZqDVTae+0tk1tn7+8FIAI0IkO+2 USwrP2P6UszCTljgKzyfk42RQc6SWYWgX+jwYahwV6HqPPop4F/WNeF9Jm9BcDKhq/ SWL3RmCPKNuZQ== Message-ID: <0b479256-1266-4c9c-a565-6e2a68573ddd@kernel.org> Date: Thu, 26 Mar 2026 11:44:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 20/21] mm: add mmap_action_map_kernel_pages[_full]() Content-Language: en-US To: "Lorenzo Stoakes (Oracle)" , Andrew Morton Cc: Jonathan Corbet , Clemens Ladisch , Arnd Bergmann , Greg Kroah-Hartman , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Alexander Shishkin , Maxime Coquelin , Alexandre Torgue , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Bodo Stroesser , "Martin K . Petersen" , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , David Hildenbrand , "Liam R . Howlett" , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, linux-staging@lists.linux.dev, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Ryan Roberts References: <926ac961690d856e67ec847bee2370ab3c6b9046.1774045440.git.ljs@kernel.org> From: "Vlastimil Babka (SUSE)" In-Reply-To: <926ac961690d856e67ec847bee2370ab3c6b9046.1774045440.git.ljs@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: AA1004000F X-Stat-Signature: oj5568sj5zj44rgws51mjdjp5gzftunc X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1774521896-224869 X-HE-Meta: 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 ek3wog/Z zm+Fqd5wPKq0BNUm6PH6uGnHi9RZ8XzFtouza7aMFaqP0KVISDtEHQtdRgfCf7SmVi/IwBbNSyEP1lqc3mwS6NmVxPuaH4dnhVNM8hiBZ1Zd8yU6j4HudEJXt9CbKUD+dhWEDuW8PRBBJubzXxl4tdFQlwq2Uc9U3k7ma3pfxC/Rxl1TgaWu7RtHi6ZhCeeqH9tOl3lnm5z9VYH2RX6gPFL0ZkZQUBejYalYd1EapXYmyT2DTi4q6Tr3Kk0svshiWKWgpH1g4B/equ1IVHtH6/I3oYRhLzQbGcaAOTqPGJl2tGzBVfrUeJsyYePk0XoOH58iP+daYhheJ12dz3oMXIZIwfhEzNDUqmsxIlUD/ZwcXVPUasjn8k+elFNNQsTBLfT4UVZlI84MVmbTjSmlXlZw8Q51E6pDWbQg5gakQIgUfiao= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/20/26 23:39, Lorenzo Stoakes (Oracle) wrote: > A user can invoke mmap_action_map_kernel_pages() to specify that the > mapping should map kernel pages starting from desc->start of a specified > number of pages specified in an array. > > In order to implement this, adjust mmap_action_prepare() to be able to > return an error code, as it makes sense to assert that the specified > parameters are valid as quickly as possible as well as updating the VMA > flags to include VMA_MIXEDMAP_BIT as necessary. > > This provides an mmap_prepare equivalent of vm_insert_pages(). We > additionally update the existing vm_insert_pages() code to use > range_in_vma() and add a new range_in_vma_desc() helper function for the > mmap_prepare case, sharing the code between the two in range_is_subset(). > > We add both mmap_action_map_kernel_pages() and > mmap_action_map_kernel_pages_full() to allow for both partial and full VMA > mappings. > > We update the documentation to reflect the new features. > > Finally, we update the VMA tests accordingly to reflect the changes. > > Reviewed-by: Suren Baghdasaryan > Signed-off-by: Lorenzo Stoakes (Oracle) Acked-by: Vlastimil Babka (SUSE)