linux-kernel - Re: BUG: mmapfile/writev spurious zero bytes (x86

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Message-ID: <alpine.LFD.1.10.0806171429010.2907@woody.linux-foundation.org>
Date:	Tue, 17 Jun 2008 14:31:31 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Bron Gondwana <brong@...tmail.fm>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Mueller <robm@...tmail.fm>, Ingo Molnar <mingo@...e.hu>
Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,
 bisected, reproducable)



On Tue, 17 Jun 2008, Andi Kleen wrote:
> 
> Loads are not supposed to fault in copy_to_user(). Only stores are.

Andi, just shut up already.

It is "copy_user". Notice the lack of "from" or "to". That code handles 
*both* copy_to_user and copy_from_user.

> If your patch fixes something then the main wrong thing is the caller
> who passes a faulting source address.

Andi, SHUT THE F*CK UP. Read the code. Read the patch. Sorry for ever 
involving you. I don't want to hear your idiotic whining.

		Linus
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