From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id E643C8D0039 for ; Fri, 21 Jan 2011 06:15:26 -0500 (EST) Received: by gyd10 with SMTP id 10so536529gyd.14 for ; Fri, 21 Jan 2011 03:15:25 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20110121103850.GI13235@n2100.arm.linux.org.uk> References: <1295516739-9839-1-git-send-email-pullip.cho@samsung.com> <1295544047.9039.609.camel@nimitz> <20110120180146.GH6335@n2100.arm.linux.org.uk> <20110121103850.GI13235@n2100.arm.linux.org.uk> Date: Fri, 21 Jan 2011 20:15:24 +0900 Message-ID: Subject: Re: [PATCH] ARM: mm: Regarding section when dealing with meminfo From: KyongHo Cho Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org To: Russell King - ARM Linux Cc: Dave Hansen , Kukjin Kim , KeyYoung Park , linux-kernel@vger.kernel.org, Ilho Lee , linux-mm@kvack.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-ID: On Fri, Jan 21, 2011 at 7:38 PM, Russell King - ARM Linux wrote: > On Fri, Jan 21, 2011 at 11:12:27AM +0900, KyongHo Cho wrote: >> Since the size of section is 256 mib and NR_BANKS is defined as 8, >> no ARM system can have more RAM than 2GiB in the current implementation. >> If you want banks in meminfo not to cross sparsemem boundaries, >> we need to find another way of physical memory specification in the kern= el. > > There is no problem with increasing NR_BANKS. > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-s= oc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =A0http://vger.kernel.org/majordomo-info.html > I think it is not reasonable to split a contiguous physical memory into several chunks. 9 banks are required to use 2 gib. Even though you think it is no problem, it becomes a problem when we want to give physical memory information via booting command line but atag because there is a restriction in number of characters in booting command l= ine. I don't understand why larger bank size than the section size is problem. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org