linux-kernel - Re: tip: demise of tsk_cpus_allowed() and tsk_nr_cpus

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Date:   Mon, 06 Feb 2017 13:18:31 +0100
From:   Mike Galbraith <efault@....de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: tip: demise of tsk_cpus_allowed() and tsk_nr_cpus_allowed()

On Mon, 2017-02-06 at 11:31 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@....de> wrote:
> 
> > Hi Ingo,
> > 
> > Doing my ~daily tip merge of -rt, I couldn't help noticing $subject, as
> > they grow more functionality in -rt, which is allegedly slowly but
> > surely headed toward merge.  I don't suppose they could be left intact?
> >  I can easily restore them in my local tree, but it seems a bit of a
> > shame to whack these integration friendly bits.
> 
> Oh, I missed that. How is tsk_cpus_allowed() wrapped in -rt right now?

RT extends them to reflect whether migration is disabled or not.

+/* Future-safe accessor for struct task_struct's cpus_allowed. */
+static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p)
+{
+       if (__migrate_disabled(p))
+               return cpumask_of(task_cpu(p));
+
+       return &p->cpus_allowed;
+}
+
+static inline int tsk_nr_cpus_allowed(struct task_struct *p)
+{
+       if (__migrate_disabled(p))
+               return 1;
+       return p->nr_cpus_allowed;
+}