linux-kernel - Re: [patch RT 1/4] rtmutex: Make lock

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Date:   Tue, 4 Apr 2017 09:13:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        RT-users <linux-rt-users@...r.kernel.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Julia Cartwright <julia@...com>, Wargreen <wargreen@...ib.org>,
        rt-stable@...r.kernel.org
Subject: Re: [patch RT 1/4] rtmutex: Make lock_killable work

On Mon, Apr 03, 2017 at 11:21:26AM -0400, Steven Rostedt wrote:
> On Sat, 01 Apr 2017 12:50:59 +0200
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > Locking an rt mutex killable does not work because signal handling is
> > restricted to TASK_INTERRUPTIBLE.
> > 
> > Use signal_pending_state() unconditionaly.
> 
> Does this mean rt mutex killable is not INTERRUPTIBLE? because the
> change log seems to just assume that.

> > -		if (unlikely(state == TASK_INTERRUPTIBLE)) {

#define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)


I don't think we need to consider people who don't know where to find
the TASK_state definitions.