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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l187-20020a6391c4000000b0050befeed875si22944510pge.32.2023.03.24.23.25.46; Fri, 24 Mar 2023 23:25:58 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=fuhyJhtH; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232329AbjCYGKs (ORCPT + 99 others); Sat, 25 Mar 2023 02:10:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232178AbjCYGKQ (ORCPT ); Sat, 25 Mar 2023 02:10:16 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D7FB0199E6; Fri, 24 Mar 2023 23:09:52 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id 7EE26B82701; Sat, 25 Mar 2023 06:09:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83C6CC4339C; Sat, 25 Mar 2023 06:09:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679724590; bh=jGLEKz2iqm7cMnQrUVYJL5S3M5/KheRmpBTQnwRR4g4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fuhyJhtHzN+qD82eoHpuLDmXvrAMorZAr/P2o9L7nfyMZs+HIZtlbR/vnexnzPPjQ 12iIcEMI6k/xnEuBxza1yG4SvIvAheU/XCDxj9gy6c8UT7rYqfDWnjxYZiyjIXQAuy Cw34EEoqONyrKGAC98SVlOM7KjkkGBpNPwdVBNVWwyepw3TPFnhRUAq46TiDceB7E7 LeHj8+xXZvSL9hRooqfhuKq1rb6GdFsD/ILlZPFfH5bv7Ub5fU9N1un8RFGJx5BKUF kdIUdTKCsI2Rz3oDl6ivjSPmrOXjW1ME7NKfBDtabqTOC+CfbdMm1qLscuK7AucmqO 8QqzrxYbPBEtw== 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 09/14] powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text Date: Sat, 25 Mar 2023 09:08:23 +0300 Message-Id: <20230325060828.2662773-10-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-Spam-Status: No, score=-5.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761319907393681027?= X-GMAIL-MSGID: =?utf-8?q?1761319907393681027?= 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) --- arch/powerpc/Kconfig | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 24d56536b269..c0095bf795ca 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -896,7 +896,7 @@ config DATA_SHIFT 8M pages will be pinned. config ARCH_FORCE_MAX_ORDER - int "Maximum zone order" + int "Order of maximal physically contiguous allocations" range 7 8 if PPC64 && PPC_64K_PAGES default "8" if PPC64 && PPC_64K_PAGES range 12 12 if PPC64 && !PPC_64K_PAGES @@ -910,17 +910,19 @@ config ARCH_FORCE_MAX_ORDER range 10 63 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. The page size is not necessarily 4KB. For example, on 64-bit systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep this in mind when choosing a value for this option. + Don't change if unsure. + config PPC_SUBPAGE_PROT bool "Support setting protections for 4k subpages (subpage_prot syscall)" default n