linux-kernel - Re: [REGRESSION] 998ef75ddb and aio-dio-invalidate-failure w/ data=journal

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Message-ID: <B602A991-01B4-42E7-AF13-1E21DFB714F8@zytor.com>
Date:	Mon, 05 Oct 2015 13:49:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>
CC:	"Theodore Ts'o" <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] 998ef75ddb and aio-dio-invalidate-failure w/ data=journal

On October 5, 2015 1:22:44 PM PDT, Linus Torvalds <torvalds@...ux-foundation.org> 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.)


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