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: 13185325 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 185A6C6FD1D for ; Thu, 23 Mar 2023 09:23:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AAA056B0074; Thu, 23 Mar 2023 05:23:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A5A2B6B0075; Thu, 23 Mar 2023 05:23:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9221C6B0078; Thu, 23 Mar 2023 05:23:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 842636B0074 for ; Thu, 23 Mar 2023 05:23:25 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 2185C1A068D for ; Thu, 23 Mar 2023 09:23:25 +0000 (UTC) X-FDA: 80599624770.12.01BFF79 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf04.hostedemail.com (Postfix) with ESMTP id 6CF274000E for ; Thu, 23 Mar 2023 09:23:23 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=S9vNGrWj; spf=pass (imf04.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1679563403; a=rsa-sha256; cv=none; b=8o+ILNxzLx1Eg7WUdtm/fDbCyG5tzDd6Y9Wh5cSqbjvWDWsLx/Bl3z4Z/W1wYuoxLY8WZS iIv2JNLfoLwl1+O+Hf0GNPg8GI5urUA2frp6yYtgekfuCyOEQ1Zh0WYzkjEJg4tFTiqcNb j/QX7kjCZT0iwguXWNmWprV+n0dYFXQ= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=S9vNGrWj; spf=pass (imf04.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1679563403; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=zCRsd73vS0MuZIC2LxtAq8bRMDrTRHHZ1DbhZdCeQ3M=; b=0Ife0baWwdj5bUO8vQdAsGp2gjVbKynBoQDzr9Jy3rc4HUsoI/l5/TfsRTsYbdEr8WsTtv AB7Hl7uO3IFhVEl6WgRHq/iw3YxATDC0F2hx+gMcdjx/PsO7LOgKJ4okfJrqV7BQpvou08 4826aVfFeBKWiMyJ06Gm3dVDhFKHHR8= 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-Rspam-User: X-Rspamd-Queue-Id: 6CF274000E X-Rspamd-Server: rspam01 X-Stat-Signature: c7y85oekunccsq8ccgm5xzcyx79kt7ff X-HE-Tag: 1679563403-300240 X-HE-Meta: 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 CTqx1QaN v/jsj+UtDuP/+UgDqGtEz7mjLTBXWj035ZK1vGdzMs8CzbZAgCpGs7/iC2OkqMvWwrnbKU063HmAsLiuclU0c10zPy0Tx1Xl58LNfZb7MJs/mPTtiEluRUK5gSzzV8dOowywgmhVaHKK0nykjdnUR8E4mm23FeDlnmttocwqi8M2oQ2dgUg80OLi1WO77Er6XZLAo4C4uACl1F8i2zptMQPBjvxHgM8QoW+K/tdkInuiDvdN86V1xEcgeKSGlyO0XBCJ5kkZVrA0kClWMhN3xXptZcDD2CkBnvvPrGopql0MaU7GkqPgcO/7dCNR+lE+7NecGXQ7vE2Je9a1WYRHRjXzg8aVtOSCyj1ZXoocwHAmJdwvkLPzCj2orbpKcnNSqeCzMnRlvLsGFQVNwzfmgVuUzGAkgjlsqV+az7hAqN5nnqlQ4RwrMqM064z+KzHtoKA3w X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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