linux-kernel - Re: RFD: x32 ABI system call numbers

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Message-ID: <20110831205439.1a0c94da@lxorguk.ukuu.org.uk>
Date:	Wed, 31 Aug 2011 20:54:39 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H.J. Lu" <hjl.tools@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Kuo <rkuo@...eaurora.org>,
	Mark Salter <msalter@...hat.com>,
	Jonas Bonn <jonas@...thpole.se>,
	Tobias Klauser <tklauser@...tanz.ch>
Subject: Re: RFD: x32 ABI system call numbers

On Wed, 31 Aug 2011 12:44:04 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> On 08/31/2011 12:18 PM, Arnd Bergmann wrote:
> >>
> >> You do realize that there are probably quite a lot of programs that
> >> depend on signed time_t because they really do care about dates before
> >> 1970?
> > 
> > Yes, it already occurred to me after I had written the above that we
> > really want it to be signed, especially to allow a meaningful conversion
> > at least one-way between 32 and 64 bit time_t values.
> > 
> 
> The only reason I mentioned redefining 32-bit time_t as unsigned was for
> *legacy ABIs*.

But if you redefine it then it's not a legacy ABI any more - its a new
ABI. Might as well just cause the pain. 64bit has already done much of
the cleaning up.
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