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Date:	Tue, 6 Oct 2015 09:56:52 +0200
From:	Ingo Molnar <>
To:	"H. Peter Anvin" <>
Cc:	Linus Torvalds <>,
	Dave Hansen <>,
	Theodore Ts'o <>,
	Andrew Morton <>,
	"" <>,
	Linux Kernel Mailing List <>
Subject: Re: [REGRESSION] 998ef75ddb and aio-dio-invalidate-failure w/

* H. Peter Anvin <> wrote:

> On October 5, 2015 1:22:44 PM PDT, Linus Torvalds <> wrote:
> >
> > We could probably do them outside the loop, rather than tightly around the 
> > actual move instructions. Peter (hpa), is there some sane interface to try to 
> > do that?
> There are... in particular the get_user_try/catch mechanism, used among other 
> things by the signal handing, as well as the copy functions (I don't have the 
> original code in front of me so I don't have the context which would be 
> appropriate.)

Yes, but note that those interfaces are x86 only at the moment, so they'd have to 
be factored out and generalized before we can use it in generic code.


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