linux-kernel - RE: [PATCH] ipvs: Remove unused variable ret from sync_thread

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B7406@saturn3.aculab.com>
Date:	Tue, 12 Nov 2013 14:38:22 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"Geert Uytterhoeven" <geert@...ux-m68k.org>,
	"Oleg Nesterov" <oleg@...hat.com>,
	"Ingo Molnar" <mingo@...nel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ipvs: Remove unused variable ret from sync_thread_master()

> > I've done this in the past so that the code sleeps interruptibly
> > unless there is a signal pending - which would cause it to return
> > early.
> >
> >     /* Tell scheduler we are going to sleep... */
> >     if (signal_pending(current))
> >         /* We don't want waking immediately (again) */
> >         sleep_state = TASK_UNINTERRUPTIBLE;
> >     else
> >         sleep_state = TASK_INTERRUPTIBLE;
> >     set_current_state(sleep_state);
> 
> If this is for kernel threads, I think you can wipe the pending state;
> not entirely sure how signals interact with kthreads; Oleg will know.

I did take me a while to manage to use kthreads, and we probably still
have customers who insist on using pre 2.6.18 kernels!
(In which case the processes are children of a daemon that only
return to userspace in order to exit.)

We also need to send signals (to get the process out of blocking
socket calls), so I have to use force_sig() to get the signal noticed.

The other issue was tidyup - I had to find module_put_and_exit().

	David



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