From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from rv-out-0910.google.com ([209.85.198.186]:13653 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750844AbXINGoi (ORCPT ); Fri, 14 Sep 2007 02:44:38 -0400 Received: by rv-out-0910.google.com with SMTP id k20so604058rvb for ; Thu, 13 Sep 2007 23:44:37 -0700 (PDT) Message-ID: <8bd0f97a0709132344w136f2df5ncfe4496c6c895bd8@mail.gmail.com> Date: Fri, 14 Sep 2007 02:44:37 -0400 From: "Mike Frysinger" Subject: Re: [Uclinux-dist-devel] Re: [PATCH] Blackfin arch: add some missing syscall In-Reply-To: <1189748718.5133.23.camel@roc-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1189670203.30686.15.camel@roc-desktop> <20070913081852.GC17367@parisc-linux.org> <8bd0f97a0709130137l55977c28w95cf8527ae8b9e24@mail.gmail.com> <1189673849.30686.28.camel@roc-desktop> <46E918FD.3070607@t-online.de> <1189748718.5133.23.camel@roc-desktop> Sender: linux-arch-owner@vger.kernel.org To: bryan.wu@analog.com Cc: Bernd Schmidt , bernd.schmidt@analog.com, linux-arch@vger.kernel.org, Matthew Wilcox , Linux Kernel , Paul Mundt , uclinux-dist-devel@blackfin.uclinux.org, Andrew Morton List-ID: On 9/14/07, Bryan Wu wrote: > On Thu, 2007-09-13 at 13:03 +0200, Bernd Schmidt wrote: > > Bryan Wu wrote: > > >>> but mremap doesn't -- there's even an implementation in mm/nommu.c. > > >>> Could you check the rest of these over to see if they truly don't need > > >>> to be implemented for no-mmu? > > >> you're right we want mremap, my fault > > >> > > > > > > Yes, I do think so, both sys_mremap and sys_munmap are implemented in > > > mm/nommu.c. How do think of this, Bernd? > > > > There's a mremap in nommu.c, but it doesn't do a lot that is useful. > > With some further mm changes in our tree, it's little more than a fancy > > way of saying munmap, and uClibc does not use it, so there's no > > compelling need to have it in userspace. > > Make sense. So currently Blackfin uClinux use the mremap/munmap in > uClibc? most functions like this dont have any real libc component ... uClibc will define userspace symbols that merely make a syscall iff the __NR_ exists in the headers if we have __NR_mremap in our unistd.h, we'll automagically get the mremap() symbol in uClibc which simply passes along the args to the kernel -mike