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

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Message-ID: <9b6a2b8e-365f-4155-85ca-5f72b46a7f3e@email.android.com>
Date:	Sat, 03 Sep 2011 09:40:55 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Valdis.Kletnieks@...edu, Arnd Bergmann <arnd@...db.de>
CC:	"H.J. Lu" <hjl.tools@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, 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

Valdis.Kletnieks@...edu wrote:

>On Sat, 03 Sep 2011 10:41:16 +0200, Arnd Bergmann said:
>
>(Admittedly, I'm tuning in late on this discussion, but...)
>
>> For the ioctl interface however, the __u64/__s64 type in the x32 ABI
>> must be defined with __attribute__((packed,aligned(4))) to match what
>> the kernel implements because it emulates the x86-32 ABI.
>
>Is this a cast-in-stone issue, or is it still not too late to change
>that?
>And if we change that, can we simplify anything?

The complexity of changing that would be enormous.
-- 
Sent from my mobile phone. Please excuse my brevity and lack of formatting.
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