linux-kernel - Re: [PATCH] mm: pagefault

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Message-ID: <Pine.LNX.4.62.0701102324460.3855@pademelon.sonytel.be>
Date:	Wed, 10 Jan 2007 23:28:20 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...l.org>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...l.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH] mm: pagefault_{disable,enable}()

On Wed, 10 Jan 2007, Linus Torvalds wrote:
> On Wed, 10 Jan 2007, Geert Uytterhoeven wrote:
> > This change causes lots of compile errors of the following form on m68k:
> > 
> > | linux-2.6.20-rc4/include/linux/uaccess.h: In function `pagefault_disable':
> > | linux-2.6.20-rc4/include/linux/uaccess.h:18: error: dereferencing pointer to incomplete type
> > | linux-2.6.20-rc4/include/linux/uaccess.h: In function `pagefault_enable':
> > | linux-2.6.20-rc4/include/linux/uaccess.h:33: error: dereferencing pointer to incomplete type
> 
> Ouch. However, I think your patch is bogus.
> 
> You're fixing somethign that doesn't need fixing: <linux/uaccess.h> 
> already includes <linux/preempt.h> for the preemption functions.

Indeed.

> The REAL problem seems to be that the m68k preempt.h (or rather, to be 
> exact, asm/thread_info.h) doesn't do things right, and while it exposes 
> "inc_preempt_count()", it doesn't expose enough information to actually 
> use it.
> 
> I think your "current_thread_info()" is broken.

But struct task_struct is defined in <linux/sched.h>, which cannot be included
in <asm/thread_info.h> due to include recursion hell.

The alternative is to move struct task_struct to its own file, which may be a
bit too intrusive for 2.6.20.

So I'm afraid my patch is the least intrusive solution. Or am I missing
something?

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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