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Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

From Arnd Bergmann <arnd@arndb.de>
Newsgroups linux.kernel
Subject Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it
Date 2016-05-12 11:30 +0200
Message-ID <rxV6q-2GU-7@gated-at.bofh.it> (permalink)
References <rkHkD-2hR-23@gated-at.bofh.it> <rxI9b-6rJ-1@gated-at.bofh.it> <rxUWK-2AG-3@gated-at.bofh.it>
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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.

	Arnd

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Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-06 14:30 +0200
  Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-10 09:50 +0200
    Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-10 10:00 +0200
    Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-10 10:40 +0200
      Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-10 11:50 +0200
        Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-10 13:50 +0200
          Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-10 14:50 +0200
            Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-10 15:00 +0200
              Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-11 04:10 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-11 10:20 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-11 12:20 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-11 13:20 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-11 17:00 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-12 05:50 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-12 15:00 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it Yury Norov <ynorov@caviumnetworks.com> - 2016-05-12 15:20 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-11 13:00 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it Catalin Marinas <catalin.marinas@arm.com> - 2016-05-11 19:00 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-11 21:40 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it Catalin Marinas <catalin.marinas@arm.com> - 2016-05-12 11:20 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-12 11:30 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table  (in entry.S) to use it "Zhangjian (Bamvor)" <bamvor.zhangjian@huawei.com> - 2016-05-12 15:00 +0200
                Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-12 15:10 +0200

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