From patchwork Wed Jul 1 21:45:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russell King X-Patchwork-Id: 6706871 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2794A9F38C for ; Wed, 1 Jul 2015 21:50:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 47D9D20797 for ; Wed, 1 Jul 2015 21:50:09 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 74F992078C for ; Wed, 1 Jul 2015 21:50:08 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZAPrd-0004fT-Ko; Wed, 01 Jul 2015 21:48:17 +0000 Received: from pandora.arm.linux.org.uk ([2001:4d48:ad52:3201:214:fdff:fe10:1be6]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZAPrb-0003NB-5b for linux-arm-kernel@lists.infradead.org; Wed, 01 Jul 2015 21:48:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=arm.linux.org.uk; s=pandora-2014; h=Date:Sender:Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Subject:To:From; bh=pIGR7Zy3lfipGeXW/gCgyEqEHJR4lVfQ+At66tyYiZY=; b=R3tU8MZq4wJEHH6yXzot+YZdGpprKamGLOtEbEP+ifi9UPhndaKQvfBhYsrafm02VjoX1RIu0Ky4LItUx0z45LT+XAnXTEMkMLnURzjWEmibo+WxHcVelVCCdC5BIhBI2kMKZgsez+1pypd2YEj7xnP/rGYsoJunKTXylDb96Ks=; Received: from e0022681537dd.dyn.arm.linux.org.uk ([2001:4d48:ad52:3201:222:68ff:fe15:37dd]:41280 helo=rmk-PC.arm.linux.org.uk) by pandora.arm.linux.org.uk with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1ZAPpG-00070s-5V for linux-arm-kernel@lists.infradead.org; Wed, 01 Jul 2015 22:45:50 +0100 Received: from rmk by rmk-PC.arm.linux.org.uk with local (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1ZAPpF-0003NZ-C5 for linux-arm-kernel@lists.infradead.org; Wed, 01 Jul 2015 22:45:49 +0100 From: Russell King To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: add help text for HIGHPTE configuration entry MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Wed, 01 Jul 2015 22:45:49 +0100 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150701_144815_470320_E531663A X-CRM114-Status: GOOD ( 10.03 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add some help text for the HIGHPTE configuration entry. This comes from the x86 entry, but reworded to be more a more accurate description of what this option does. Signed-off-by: Russell King --- arch/arm/Kconfig | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 45df48ba0b12..cc0ea0c6cfc9 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1661,6 +1661,12 @@ config HIGHMEM config HIGHPTE bool "Allocate 2nd-level pagetables from highmem" depends on HIGHMEM + help + The VM uses one page of physical memory for each page table. + For systems with a lot of processes, this can use a lot of + precious low memory, eventually leading to low memory being + consumed by page tables. Setting this option will allow + user-space 2nd level page tables to reside in high memory. config HW_PERF_EVENTS bool "Enable hardware performance counter support for perf events"