linux-kernel - Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64

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Date:	Tue, 17 May 2016 15:40:47 +0000
From:	Joseph Myers <joseph@...esourcery.com>
To:	Szabolcs Nagy <szabolcs.nagy@....com>
CC:	Yury Norov <ynorov@...iumnetworks.com>, <arnd@...db.de>,
	<catalin.marinas@....com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <nd@....com>,
	<linux-arch@...r.kernel.org>, <linux-s390@...r.kernel.org>,
	<pinskia@...il.com>, <Prasun.Kapoor@...iumnetworks.com>,
	<schwab@...e.de>, <broonie@...nel.org>,
	<linux-doc@...r.kernel.org>, <heiko.carstens@...ibm.com>,
	<agraf@...e.de>, <klimov.linux@...il.com>,
	<bamvor.zhangjian@...wei.com>, <schwidefsky@...ibm.com>,
	<Nathan_Lynch@...tor.com>,
	<christoph.muellner@...obroma-systems.com>,
	GNU C Library <libc-alpha@...rceware.org>
Subject: Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64

On Tue, 17 May 2016, Szabolcs Nagy wrote:

> i think even legacy software should be able to deal with 64bit off_t,
> so we could avoid having two sets of filesystem apis or is 64bit-only
> off_t more work to do in linux/glibc?

wordsize-64 directories generally expect 64-bit interfaces.  wordsize-32 
directories generally expect that there are two sets of filesystem APIs 
which are not aliased (at the userspace level - the versions for the 
generic syscall API deal with setting EOVERFLOW in userspace as needed).

The "wordsize" concept is not wonderfully well-defined and could do with 
being split up into multiple better-defined concepts, but that's obvious 
something pretty tricky to get right, involving a very careful analysis of 
the existing code.

-- 
Joseph S. Myers
joseph@...esourcery.com