netdev - Re: [GIT PULL] Namespace file descriptors for 2.6.40

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Date:	Wed, 25 May 2011 15:00:30 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Valdis.Kletnieks@...edu,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.osdl.org>,
	netdev@...r.kernel.org
Subject: Re: [GIT PULL] Namespace file descriptors for 2.6.40

On Wed, May 25, 2011 at 14:47, Ingo Molnar <mingo@...e.hu> wrote:
> * Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
>> > But at least the primary, 'native' syscall table of every arch
>> > could be kept rather fresh via generic enumeration.
>>
>> So we can start all over at offset 501 (alpha just started using
>> 500) with a unified, clean, and compressed list of syscalls? Or do
>> we have some more other-os-compat syscalls around in this range?
>
> No, that would leave a big hole in the syscall table of most
> architectures.

Sure, but we could (a) optimize for the case where the syscall number is
larger than 500 and/or (b) drop support for syscall numbers smaller than
501, depending on a config option.

> So what would be needed is for each architecture to define a 'generic
> syscall table base index', ARCH_SYSCALL_BASE or so, and the generic
> syscalls would be added for that.
>
> Alpha would have 501, the others lower numbers.
>
> The only general assumption we can rely on is that there's a range of
> not yet used syscall numbers starting at the end of the current
> syscall table.

Yep, that would work too.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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