linux-kernel - Re: + signal-turn-dequeue_signal_lock-into-kernel_dequeue

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Message-ID: <20151024194826.GA14895@redhat.com>
Date:	Sat, 24 Oct 2015 21:48:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Markus Pargmann <mpa@...gutronix.de>
Cc:	akpm@...ux-foundation.org, balbi@...com, dwmw2@...radead.org,
	tj@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: +
	signal-turn-dequeue_signal_lock-into-kernel_dequeue_signal.patch
	added to -mm tree

Hi Markus,

s/mm-commits/lkml/

On 10/24, Markus Pargmann wrote:
>
> On Mon, Oct 05, 2015 at 02:19:27PM -0700, akpm@...ux-foundation.org wrote:
> >
> > Subject: signal: turn dequeue_signal_lock() into kernel_dequeue_signal()
> >
> > 1. Rename dequeue_signal_lock() to kernel_dequeue_signal(). This
> >    matches another "for kthreads only" kernel_sigaction() helper.
> >
> > 2. Remove the "tsk" and "mask" arguments, they are always current
> >    and current->blocked. And it is simply wrong if tsk != current.
> >
> > 3. We could also remove the 3rd "siginfo_t *info" arg but it looks
> >    potentially useful. However we can simplify the callers if we
> >    change kernel_dequeue_signal() to accept info => NULL.
> >
> > 4. Remove _irqsave, it is never called from atomic context.
>
> I just realised that this patch will conflict with a fixup patch for nbd
> that will be included in rc7.
>
> dcc909d90ccd (nbd: Add locking for tasks)
>
> I think there is basically one new instance of dequeue_signal_lock() that
> needs to be replaced with kernel_dequeue_signal().

Thanks! I'll send *-fix.patch to Andrew.

But you know, dcc909d90ccd (nbd: Add locking for tasks) doesn't look exactly
right at first glance, although I need to re-check tomorrow...

One question, can sock_xmit() be called from user space? Or it is only called
by kthreads?

Oleg.

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