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

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Date:	Wed, 10 Jan 2007 14:16:59 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.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, 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.

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.

		Linus
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