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

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Message-ID: <alpine.LFD.1.10.0806171432570.2907@woody.linux-foundation.org>
Date:	Tue, 17 Jun 2008 14:34:01 -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, Linus Torvalds wrote:
> 
> It is "copy_user". Notice the lack of "from" or "to". That code handles 
> *both* copy_to_user and copy_from_user.

Oh, and yes, I said "copy_to_user_inatomic()" by mistake. The fact is that 
"write()" obviously does copy_from_user, but more importantly that on x86 
it's THE EXACT SAME ROUTINE. 

			Linus
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