From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932573AbcELMuP (ORCPT ); Thu, 12 May 2016 08:50:15 -0400 Received: from szxga05-in.huawei.com ([58.251.152.179]:56526 "EHLO szxga05-in.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932506AbcELMuL (ORCPT ); Thu, 12 May 2016 08:50:11 -0400 Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it To: Arnd Bergmann , Catalin Marinas References: <1459894127-17698-1-git-send-email-ynorov@caviumnetworks.com> <4989778.Fs81NJurjH@wuerfel> <20160512091758.GB11226@e104818-lin.cambridge.arm.com> <2733875.IzutTZKHMc@wuerfel> CC: , Andrew Pinski , , Yury Norov , Hanjun Guo , , , , "jijun (D)" , , , , , , , , , , Andrew Pinski , , , "Zhangjian (Bamvor)" From: "Zhangjian (Bamvor)" Message-ID: <57347BD4.8010105@huawei.com> Date: Thu, 12 May 2016 20:49:24 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <2733875.IzutTZKHMc@wuerfel> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.111.72.170] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090203.57347BF1.0014,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 653e91fddc8f3a25f20215ce2f6e565f Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 2016/5/12 17:21, Arnd Bergmann wrote: > On Thursday 12 May 2016 10:17:58 Catalin Marinas wrote: >> On Wed, May 11, 2016 at 09:30:07PM +0200, Arnd Bergmann wrote: >>> On Wednesday 11 May 2016 17:59:01 Catalin Marinas wrote: >>> >>> I don't think the shifts are a problem, the main downside would be >>> the limit to 44 bits of file offsets (16TB files), but it's also >>> unclear if that is a practical problem at all. If it is, we run >>> into the same problem on all other 32-bit architectures too. >> >> I hope people are seriously thinking of moving to an LP64 ABI if they >> have such large file offset needs. > > Good point. 44 bits of file size is certainly enough for mmap() > on a 32-bit task: you would only be able to map a very small fraction > of the file anyway, and if you want to map larger files, and should > move to 64-bit tasks long before this becomes a limitation. Hi, I apply the following patch in order to make use of the REAL mmmap2. LTP test pass in litle endian. mmap16 successful with segfault in big endian. BTW, I saw the similar code in tile, mips, microblaze and s390 compat. Should we merge these code into a common syscall wrapper? kernel: diff --git a/arch/arm64/kernel/sys_ilp32.c b/arch/arm64/kernel/sys_ilp32.c index d85fe94..2cd72eb 100644 --- a/arch/arm64/kernel/sys_ilp32.c +++ b/arch/arm64/kernel/sys_ilp32.c @@ -41,7 +41,16 @@ #define compat_sys_sync_file_range sys_sync_file_range #define compat_sys_truncate64 sys_truncate #define sys_llseek sys_lseek -#define sys_mmap2 sys_mmap + +SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, fd, + unsigned long, pgoff) +{ + if (pgoff & (~PAGE_MASK >> 12)) + return -EINVAL; + + return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); +} asmlinkage long ilp32_sys_rt_sigreturn_wrapper(void); #define compat_sys_rt_sigreturn ilp32_sys_rt_sigreturn_wrapper glibc: diff --git a/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap.c b/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap.c index e69de29..f75e251 100644 --- a/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap.c +++ b/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap.c @@ -0,0 +1,2 @@ +#include + diff --git a/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap64.c b/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap64.c index c6c7f1d..6f1a141 100644 --- a/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap64.c +++ b/sysdeps/unix/sysv/linux/aarch64/ilp32/mmap64.c @@ -1,29 +1 @@ -#include -#include -#include -#include - -#include -#include - -/* mmap is provided by mmap as they are the same. */ -void *__mmap (void *__addr, size_t __len, int __prot, - int __flags, int __fd, __off_t __offset) -{ - void *result; - result = (void *) INLINE_SYSCALL (mmap2, 6, __addr, __len, __prot, __flags, - return result; -} -/* mmap64 is provided by mmap as they are the same. */ -void *__mmap64 (void *__addr, size_t __len, int __prot, - int __flags, int __fd, __off64_t __offset) -{ - void *result; - result = (void *) - INLINE_SYSCALL (mmap2, 6, __addr, - __len, __prot, __flags, __fd, __offset); - return result; -} -weak_alias (__mmap, mmap) -weak_alias (__mmap64, mmap64) +#include Regards Bamvor > Arnd >