From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 59EB843FD12; Tue, 14 Jul 2026 14:07:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784038036; cv=none; b=LMxOz6gOomFx/zNf51c2IPUDXdmNLu1YFy6e8e+8j42lsOjJG3TyjX+kWSeuOQXvzdq400kZ8IyuYquPDMFdxMIeXPHObFZXOC7H8iNY+EWFUuZ51JidWicZ14NN9HYKB5rKOoaZc3zGm7dnwrKg5npdCRY2mkAXe2lDyM1FBI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784038036; c=relaxed/simple; bh=rJhmHjtmDwxS2CewudUO1k4saVZojxZevQnlJp6OZ7c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TYhlUQoKrddjhBLWlAmO098EHFWwWLOOd6absRK9rCi8Y8mwylwwuYMeCVWoqC08xgWryiwZZwCGdCixZcbWJ31r5Zu34kQsRGoTXBGLStHTbR4i3fdQR6gI7IUjra9VAjC4tawsd+LNcCsExfZ2KyMQ3epd5b59h5KNO1bhCOE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=P+LRFNmi; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="P+LRFNmi" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 972261C25; Tue, 14 Jul 2026 07:07:09 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 645503F7B4; Tue, 14 Jul 2026 07:07:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784038033; bh=rJhmHjtmDwxS2CewudUO1k4saVZojxZevQnlJp6OZ7c=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=P+LRFNmiDvhW3q79+Et/h/V1cKdtJE0WCcRDkD/ESazXMLOt5jc8Kgt41NbWh4J4L irPYHd6dn5v2zgZP369nbxfm7fp2OsfV6xC2C9cTmmDmdF9sgXDGCBBMWKG6COr/1p x9UUMt3JnkFOkdtZWVFuRaLX87Bjnkvu74XTX8nc= From: Kevin Brodsky Date: Tue, 14 Jul 2026 15:04:05 +0100 Subject: [PATCH 16/22] efi: mark efi_mm as a kernel mm Precedence: bulk X-Mailing-List: linux-parisc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260714-remove_pgtable_cdtor-v1-16-44be8a7685d7@arm.com> References: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> In-Reply-To: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> To: linux-mm@kvack.org Cc: Kevin Brodsky , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Pasha Tatashin , Russell King , Catalin Marinas , Will Deacon , Ryan Roberts , linux-arm-kernel@lists.infradead.org, Huacai Chen , loongarch@lists.linux.dev, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Gerald Schaefer , linux-s390@vger.kernel.org, "David S. Miller" , Andreas Larsson , sparclinux@vger.kernel.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Ning Sun , x86@kernel.org, tboot-devel@lists.sourceforge.net, Ard Biesheuvel , Ilias Apalodimas , linux-efi@vger.kernel.org, Vishal Moola , Alistair Popple , "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1784037902; l=1355; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=rJhmHjtmDwxS2CewudUO1k4saVZojxZevQnlJp6OZ7c=; b=xEbohehI3oM6XdwxICHsVginMSV7tAi9MA1ZH+OAmyTQN4j1iQ5NsQqwBRdPZXQYf6lyJ7RCE SjcaLPZMgbgBfEX879PTsxhhu4WlXQHubYLk+EEaXhOv3f1B8VSkhhq X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= efi_mm is a kernel-owned address space used for EFI runtime mappings, but it is currently treated like a user address space when manipulating its page tables. There does not seem to be a good reason for this, and it creates unnecessary complications when creating its page tables. Mark it with the new MMF_KERNEL flag so that the page table handling treats it like init_mm. In particular, this means that: * Split page table locks are no longer initialised or used for efi_mm's page tables. * pagetable_*_ctor() and pagetable_dtor() no longer need to be called for efi_mm's page tables. Assisted-by: Codex:GPT-5.5 Signed-off-by: Kevin Brodsky --- drivers/firmware/efi/efi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 0327a39d31fa..e5ca45bdc890 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -69,6 +69,7 @@ struct mm_struct efi_mm = { .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock), .mm_users = ATOMIC_INIT(2), .mm_count = ATOMIC_INIT(1), + .flags = MM_FLAGS_INIT(MMF_KERNEL_MASK), .write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq), MMAP_LOCK_INITIALIZER(efi_mm) .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), -- 2.51.2