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

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Message-ID: <CA+55aFyBtp-iyexHy4ccTy-qW7KqCccFfSD5HzMD_9BaXT-wjg@mail.gmail.com>
Date:	Fri, 2 Sep 2011 20:04:49 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>, "H. Peter Anvin" <hpa@...or.com>,
	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

On Fri, Sep 2, 2011 at 7:56 PM, H.J. Lu <hjl.tools@...il.com> wrote:
>
> We need to make decision on some system calls which take a pointer
> to structure with long.  For example, msg calls take a pointer to
>
>          struct msgbuf {
>               long mtype;       /* message type, must be > 0 */
>               char mtext[1];    /* message data */
>           };
>
> We have 3 choices:
>
> 1. Use long long for x32 and use 64bit msg system calls.

I think this sounds like the best option. As many plain 64-bit system
calls as humanly possible.

                Linus
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