linux-kernel - Re: [PATCH 4/6] sched: Add get_current

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Message-ID: <YLeRzlEmbdsMrFcG@hirez.programming.kicks-ass.net>
Date:   Wed, 2 Jun 2021 16:12:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
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Subject: Re: [PATCH 4/6] sched: Add get_current_state()

On Wed, Jun 02, 2021 at 10:01:29AM -0400, Mathieu Desnoyers wrote:
> ----- On Jun 2, 2021, at 9:12 AM, Peter Zijlstra peterz@...radead.org wrote:
> 
> > Remove yet another few p->state accesses.
> 
> [...]
> 
> > 
> > --- a/include/linux/sched.h
> > +++ b/include/linux/sched.h
> > @@ -212,6 +212,8 @@ struct task_group;
> > 
> > #endif
> > 
> > +#define get_current_state()	READ_ONCE(current->state)
> 
> Why use a macro rather than a static inline here ?

Mostly to be consistent, all that state stuff is macros. I suppose we
could try and make them inlines at the end or so -- if the header maze
allows.