From patchwork Thu Mar 23 09:21:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13185355 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 CC6D8C77B61 for ; Thu, 23 Mar 2023 09:24:14 +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=x84wsVWwyrT5k+JlmhJY/2TSFspcHR8lEhPV4vjs0tA=; b=qB0n1CfLII71tg UEDKlZ+MlgxPRuqHQ09gSi0hFV7Fjx6Yht8xWKtYGDEPTJEUungFp+MrblGkoEDzgOaLQMEn+5O8A 86ACu2kHrrhMX298lBhn/8iaasolKa4K4wMG8+SLhYWTlHxae3V7jhHtrNsGP2gqqhGd23fYFpArm yvqRNRTylUj4J2sEU0CHz4nRCr5cKpnNLeG1KYUYQSOPLI/P6uNWXV/gpwcaKsOIsWQ7CLP/UmXXP WNNCftMITafb4NYp7bM14tXM+4Osue42QEx4mbPAM9X/krw+t7EUm3QNpkZMgepoSxw1/4U3meFiT LmEkbXYuNZPowkDMdM1A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pfHAN-001QSG-2S; Thu, 23 Mar 2023 09:23:27 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pfHAJ-001QP1-0H for linux-arm-kernel@lists.infradead.org; Thu, 23 Mar 2023 09:23:24 +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 93DD06252F; Thu, 23 Mar 2023 09:23:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 041DAC433A7; Thu, 23 Mar 2023 09:23:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679563402; bh=/lzhNRYztJj1ouQRj918klLWnmAPsjZfq5Hpj2i7B9I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S9vNGrWjED3wIll6kE/hVbqtHfO9MyT/Hu6xNL8puEW0xDcgPxTscIk7hCO4DRRC5 ilO3FYhi6cQgQK9M7F6iTKF9trHSwbxr5hoJkfZj7dH58LZn2C0zHeNgnNbtsmUQtM hIsslwy+kW7OQFFbsPJLGsP2YYNhAjYKRraZceOdAm6m8c5i1/UJ1zDvaAj33xmKbC 6w6+dB64eKtu7qOhgcaxRaogkiGRFH33MjiIPbCNMShREvrHFXffR8koK71/C5/yo0 J7tSw2rFHv3JNHd4XhC8LmXab+nvHt/80GpNUDwm9bN1QeR0YrOvlmBRd2KSSdSgQA DNJeKxdyXaYug== 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 09/14] powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text Date: Thu, 23 Mar 2023 11:21:51 +0200 Message-Id: <20230323092156.2545741-10-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230323092156.2545741-1-rppt@kernel.org> References: <20230323092156.2545741-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230323_022323_205634_EAD6B5C1 X-CRM114-Status: GOOD ( 16.04 ) 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) --- 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