linux-kernel - Re: [PATCH v6 13/17] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Message-ID: <alpine.DEB.2.10.1511161159290.25844@digraph.polyomino.org.uk>
Date:	Mon, 16 Nov 2015 12:03:09 +0000
From:	Joseph Myers <joseph@...esourcery.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Chris Metcalf <cmetcalf@...hip.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bamvor.zhangjian@...wei.com>, Andrew Pinski <pinskia@...il.com>,
	"Kapoor, Prasun" <Prasun.Kapoor@...iumnetworks.com>,
	Andreas Schwab <schwab@...e.de>,
	Nathan Lynch <Nathan_Lynch@...tor.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Graf <agraf@...e.de>,
	Alexey Klimov <klimov.linux@...il.com>, <broonie@...nel.org>,
	Yury Norov <ynorov@...iumnetworks.com>,
	Andrew Pinski <apinski@...ium.com>,
	David Daney <ddaney.cavm@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Jan Dakinevich <jan.dakinevich@...il.com>,
	Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
	Andrey Konovalov <andrey.konovalov@...aro.org>,
	<christoph.muellner@...obroma-systems.com>,
	Mike Frysinger <vapier@...too.org>,
	Paul Eggert <eggert@...ucla.edu>, Rich Felker <dalias@...c.org>
Subject: Re: [PATCH v6 13/17] arm64:ilp32: add sys_ilp32.c and a separate
 table (in entry.S) to use it

On Mon, 16 Nov 2015, Arnd Bergmann wrote:

> There are two separate aspects here:
> 
> a) leave out the support for all __off_t based syscalls (__ftruncate,
>    __lseek, __lxstat, __pread, __preadv, __pwrite, __pwritev, __truncate,
>    __xstat) as they are no longer needed, and change the handling of
>    _FILE_OFFSET_BITS so that we default to 64 and error out for anything
>    else.
>    This needs to be done for all new 32-bit architectures if you think we
>    should use a 64-bit off_t from now on, it's not arm64 specific.

It's not a matter of leaving anything out - these would simply use 64-bit 
off_t (__off_t and __off64_t would be the same type) and the *64 versions 
would be aliases, exactly the same as on 64-bit architectures.  (And 
_FILE_OFFSET_BITS handling would also be exactly the same as on 64-bit 
architectures.)  I see no reason for the set of off_t-related symbols that 
exist, or which symbols are aliases of which others, to vary between pure 
64-bit systems and ILP32 ABIs (for 32-bit or 64-bit architectures) that 
simply happen to have had 64-bit off_t from the start.

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