linux-kernel - Re: [PATCH 0/23] File descriptor hot-unplug support v2

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Message-ID: <alpine.LFD.2.01.0906081100000.6847@localhost.localdomain>
Date:	Mon, 8 Jun 2009 11:01:51 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Miklos Szeredi <miklos@...redi.hu>, ebiederm@...ssion.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	hugh@...itas.com, tj@...nel.org, adobriyan@...il.com,
	alan@...rguk.ukuu.org.uk, gregkh@...e.de, npiggin@...e.de,
	akpm@...ux-foundation.org, hch@...radead.org
Subject: Re: [PATCH 0/23] File descriptor hot-unplug support v2



On Mon, 8 Jun 2009, Al Viro wrote:
> 
> Welcome to reality...
> 
> * bread() is non-interruptible
> * so's copy_from_user()/copy_to_user()
> * IO we are stuck upon _might_ be interruptible, but by sending a signal
> to some other process

We can probably improve on these, though.

Like the copy_to/from_user thing. We might well be able to do that whole 
"if it's a fatal signal, return early" thing.

So in the _general_ case - no, we probably can't fix things. But we could 
likely at least improve in some common cases if we cared.

			Linus
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