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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Date:	Mon, 16 Nov 2015 10:16:35 +0000
From:	Joseph Myers <joseph@...esourcery.com>
To:	Chris Metcalf <cmetcalf@...hip.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	<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 Sun, 15 Nov 2015, Chris Metcalf wrote:

> I've added Rich, Paul, Joseph, and Mike to the cc's as they are probably 
> a good subset of libc-alpha to help comment on these issues.  My sense 
> is that right now, it wouldn't be possible to add a 32-bit architecture 
> with a non-32-bit default for _FILE_OFFSET_BITS.  And, obviously, this 
> is why, when I added the tilegx32 APIs to glibc in 2011, I needed to 
> provide _FILE_OFFSET_BITS=32 support.

x32 uses 64-bit off_t only.  That's not a problem; the problems are 
tv_nsec not of type long, a bug we should avoid for all new ports (padding 
on tv_nsec is fine; treating that padding as a significant high part of a 
64-bit value on input to glibc / kernel interfaces isn't), and maybe some 
other types being 64-bit unnecessarily, although as far as I know the 
suggested issues there 
<https://sourceware.org/bugzilla/show_bug.cgi?id=16438> are all 
theoretical.

It's true that we don't have a very clear notion of what "wordsize-64" 
sysdeps directories mean in glibc for cases such as x32.  See 
<https://sourceware.org/bugzilla/show_bug.cgi?id=14116>.

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