linux-kernel - Re: [GIT PULL] VFIO fixes for v4.1-rc2

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Date:	Fri, 01 May 2015 12:48:57 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [GIT PULL] VFIO fixes for v4.1-rc2

On Fri, 2015-05-01 at 11:37 -0700, Linus Torvalds wrote:
> On Fri, May 1, 2015 at 10:40 AM, Alex Williamson
> <alex.williamson@...hat.com> wrote:
> >
> > - Flush signals on interrupted wait to retain polling interval (Alex Williamson)
> 
> This cannot *possibly* be right. If I read this patch right, you're
> randomly just getting rid of signals. No way in hell is that correct.
> 
> "flush_signals()" is only for kernel threads, where it's a hacky
> alternative to actually handling them (since kernel threads never
> rreturn to user space and cannot really "handle" a signal). But you're
> doing it in the ->remove handler for the device, which can be called
> by arbitrary system processes. This is not a kernel thread thing, as
> far as I can see.
> 
> If you cannot handle signals, you damn well shouldn't be using
> "wait_event_interruptible_timeout()" to begin with. Get rid of the
> "interruptible", since it apparently *isn't* interruptible.
> 
> So I'm not pulling this.

Ok.  It seemed like useful behavior to be able to provide some response
to the user in the event that a ->remove handler is blocked by a device
in-use and the user attempts to abort the action.  Thanks for reviewing,

Alex

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