linux-kernel - Re: [PATCH 00/25] Change time_t and clock

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Message-ID: <53769B27.2090407@zytor.com>
Date:	Fri, 16 May 2014 16:11:35 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>,
	"Joseph S. Myers" <joseph@...esourcery.com>
CC:	Chung-Lin Tang <cltang@...esourcery.com>,
	John Stultz <john.stultz@...aro.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Christoph Hellwig <hch@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ley Foon Tan <lftan@...era.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	LeyFoon Tan <lftan.linux@...il.com>
Subject: Re: [PATCH 00/25] Change time_t and clock_t to 64 bit

On 05/15/2014 01:38 PM, Arnd Bergmann wrote:
> 
> For practical purposes in the kernel, we may still want to use 64-bit
> nanoseconds: if we use a 96 bit struct timespec, that would be incompatible
> with the native type on 64-bit kernels, thus complicating the syscall
> emulation layer.
> 
> I don't know why timespec on x32 uses 'long tv_nsec', it does seem
> problematic.

struct timespec is specified in POSIX as having type "long" for tv_nsec.
 This, as Linus pointed out, is totally braindamaged.

x32 does not follow POSIX (Linus pretty much dictated that), and instead
does the __kernel_suseconds_t to match the native kernel type.  The
proposal at some point was to try to push a snseconds_t into POSIX.

	-hpa

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