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

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Message-ID: <4095406.jADDlVRiDg@wuerfel>
Date:	Wed, 18 May 2016 00:45:51 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Andreas Schwab <schwab@...e.de>
Cc:	Joseph Myers <joseph@...esourcery.com>,
	Szabolcs Nagy <szabolcs.nagy@....com>,
	Yury Norov <ynorov@...iumnetworks.com>,
	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,
	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 Tuesday 17 May 2016 18:02:36 Andreas Schwab wrote:
> Joseph Myers <joseph@...esourcery.com> writes:
> 
> > On Tue, 17 May 2016, Arnd Bergmann wrote:
> >
> >> I think it has become easier to override now and we just need to
> >> update sysdeps/unix/sysv/linux/generic/bits/typesizes.h to set
> >> 
> >> #define __INO64_T_TYPE          __UQUAD_TYPE
> >> #define __OFF64_T_TYPE          __UQUAD_TYPE
> >> #define __OFF_T_MATCHES_OFF64_T        1
> >> #define __INO_T_MATCHES_INO64_T        1
> >> 
> >> for new architectures (obviously not the ones that already use the
> >> 32-bit types). I haven't tries this, so there may be other things
> >> that are required.
> >
> > I think more than that would be needed to get struct stat to match and get 
> > things aliased for that (which is presumably desirable).
> 
> Looking at sysdeps/unix/sysv/linux/generic/bits/stat.h, there is at
> least blkcnt_t that differs between stat and stat64.  And you probably
> want to alias statfs and statfs64 as well, ie. fs{blk,fil}cnt_t.

Makes sense. Indeed that is a bit more work than I hoped, in particular
if we have to audit the uses of __WORDSIZE as well.

	Arnd