From patchwork Sat Mar 25 06:08:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13187610 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 57421C6FD1F for ; Sat, 25 Mar 2023 06:10:03 +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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DLAFzXu72PJX+noAMuzLDv8uWglYGVy7ta3Lr0oIN7s=; b=bJNAr1o4WX/pL0 K1v9vYH40vE/nxFs8IQuKClN5kuLz4TfnmEidxWDL4ADz4BTeI2ojlqY8L2XfLadfH9aiGKeMb5Q1 2U/SGLJ96GGLinW6AxAhV3O6gRkKcyaButHcgE5yndNOHjfSJZxCiIjFjGVPziyszzzGkatyKXDHO DZ0WCMRSSDrwDPV7skvUT3bYDLfhSr/H4/1ndzlg3rjkmCluN8pwic1gtxJWMrde9s1h4F2xMZJRk EaB01Y+XduIujyKSgenHPEZXsK635JkQE7UkVCQ8ffCVDNgXqW+lIrBZ6d0SdeeqoS76bNgMR4dHB rV3ISqXTr/dXQe6GmgSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pfx5a-006Bks-0D; Sat, 25 Mar 2023 06:09:18 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pfx5S-006BhW-0I for linux-arm-kernel@lists.infradead.org; Sat, 25 Mar 2023 06:09:11 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 54EA260A08; Sat, 25 Mar 2023 06:09:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 870B1C433D2; Sat, 25 Mar 2023 06:09:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679724547; bh=qNh6nhkYIBdXaRuLL5GYGOpZBsiUYM9+UhineGTjJPU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rirI1LE3IL192S0yKzg6Y9hCPNuKuJBa8/FnRMwHG+5iLbDwTy50fX949R6Y63xTF UXgqPugUFhJmfiXPsf80n0rIx2hpYxXgF013LBy9/cuaPPknS52iQCHlE9I/eNqysy YA5VqoQdNZbXputm2MtEunhOqdux1Kh0R1JI/PpfdvIMBpHcnD+7de9og02ue3WXm9 0M/AXHZ0+Vav4cfU8cZirL/pvPdBPSCqFqtvhnml0w4rkC9tX34dsfUjcp9G6nULZG oBPlI/jXvQ4LSznp1Wy4B+lgG4MPAphGjzPzbxy93VbPRvoljM+BMe3yd5jHEvzR4E ThQp2TwEZDftA== From: Mike Rapoport To: Andrew Morton Cc: Arnd Bergmann , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , John Paul Adrian Glaubitz , "Kirill A. Shutemov" , Max Filippov , Michael Ellerman , Mike Rapoport , Rich Felker , Russell King , Will Deacon , Yoshinori Sato , Zi Yan , linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org Subject: [PATCH v3 03/14] arm64: reword ARCH_FORCE_MAX_ORDER prompt and help text Date: Sat, 25 Mar 2023 09:08:17 +0300 Message-Id: <20230325060828.2662773-4-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230325060828.2662773-1-rppt@kernel.org> References: <20230325060828.2662773-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230324_230910_214151_F185E6E6 X-CRM114-Status: GOOD ( 18.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Mike Rapoport (IBM)" The prompt and help text of ARCH_FORCE_MAX_ORDER are not even close to describe this configuration option. Update both to actually describe what this option does. Acked-by: Kirill A. Shutemov Reviewed-by: Zi Yan Signed-off-by: Mike Rapoport (IBM) Reviewed-by: Kefeng Wang --- arch/arm64/Kconfig | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7324032af859..cc11cdcf5a00 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1487,24 +1487,24 @@ config XEN # 16K | 27 | 14 | 13 | 11 | # 64K | 29 | 16 | 13 | 13 | config ARCH_FORCE_MAX_ORDER - int "Maximum zone order" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES) + int "Order of maximal physically contiguous allocations" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES) default "13" if ARM64_64K_PAGES default "11" if ARM64_16K_PAGES default "10" help - The kernel memory allocator divides physically contiguous memory - blocks into "zones", where each zone is a power of two number of - pages. This option selects the largest power of two that the kernel - keeps in the memory allocator. If you need to allocate very large - blocks of physically contiguous memory, then you may need to - increase this value. + The kernel page allocator limits the size of maximal physically + contiguous allocations. The limit is called MAX_ORDER and it + defines the maximal power of two of number of pages that can be + allocated as a single contiguous block. This option allows + overriding the default setting when ability to allocate very + large blocks of physically contiguous memory is required. - We make sure that we can allocate up to a HugePage size for each configuration. - Hence we have : - MAX_ORDER = PMD_SHIFT - PAGE_SHIFT => PAGE_SHIFT - 3 + The maximal size of allocation cannot exceed the size of the + section, so the value of MAX_ORDER should satisfy - However for 4K, we choose a higher default value, 10 as opposed to 9, giving us - 4M allocations matching the default size used by generic code. + MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS + + Don't change if unsure. config UNMAP_KERNEL_AT_EL0 bool "Unmap kernel when running in userspace (aka \"KAISER\")" if EXPERT