From patchwork Fri Mar 24 05:22:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13186451 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 A3DEEC77B60 for ; Fri, 24 Mar 2023 05:24:54 +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=gkkV1kkEpjeJYOlcS2Es0iKp4qolj/66Tx99wDilUx4=; b=hdSqVZvzaqew7v ciCr98Xjtq/g4qXdpMXNgPMKwjSG7/AFDgtaDA0LImSGwMxmxIoirBOhYAbuuLwdgpOyPrgTqnsY5 8fvzZpifolTZBEmMztojd00JAnwqhUMdnWOnTb8EvfZnQqPTBujDEYeYGsHiwmMxM552s9bMAla31 jfWm4DiZxo2SD7O+tSQWJJVzSNbkAQiEYgL+vI5WECEVEGX9eC/9yQQYGQJ42MFqhvHucxz+TTBlo 9GRqqLMPNyQ0Rbc5+gVMQaYM6Dz/bvxzl7gwfMEbw2TVpIre1GDe5l0+gyL+eb3XsdIQqkgbt997h Db+9VAuyjwXapth/bLbg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pfZuG-003ZgF-1R; Fri, 24 Mar 2023 05:24:04 +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 1pfZu9-003Zc7-2i for linux-arm-kernel@lists.infradead.org; Fri, 24 Mar 2023 05:23:59 +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 409C6628E6; Fri, 24 Mar 2023 05:23:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BFCFC4339C; Fri, 24 Mar 2023 05:23:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679635437; bh=UVsispKOXrBQIEvWETypgEvjsfcHzjlmC/4ErOkgTNY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fqCbMYSMHRA8KSzswP21kxD34OBvPg5Oroes5iFhMPJ9Jc9lUvLPdfZusBSVzxRjD ZlU6JqXwo7gqufTHgsi7V2KYkqvPdhXWJniY546kA+HW//VjjbzDJ5M21/A8oWT0Lc cETKEhPNKLa2fOzp+XVPD0qVEl0P7kiVmNLagl9k1laXXohAb6JbmnGiNxTwWDsuS0 h8cxMHFbqttSNXkLPI/vicrjWlcEAN1g8TI7yesPlErb1aBdTV3L7Hi1bMNc6+Bt0l 23BSyQJZuTuaAN09/B8wSFzbZ3vkeBkT2OBZEGsqb1Gwi8JLs1MyWMHpy7vS3iIw6J HLZTIgog+NgUA== 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 v2 09/14] powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text Date: Fri, 24 Mar 2023 08:22:28 +0300 Message-Id: <20230324052233.2654090-10-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230324052233.2654090-1-rppt@kernel.org> References: <20230324052233.2654090-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230323_222357_959722_C966A860 X-CRM114-Status: GOOD ( 16.01 ) 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. Signed-off-by: Mike Rapoport (IBM) Acked-by: Kirill A. Shutemov --- 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