linux-kernel - Re: [PATCH 2/3] mm: Extract might

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Date:   Fri, 20 Nov 2020 18:31:41 +0100
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Linux MM <linux-mm@...ck.org>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Michel Lespinasse <walken@...gle.com>,
        Waiman Long <longman@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Chinner <david@...morbit.com>, Qian Cai <cai@....pw>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH 2/3] mm: Extract might_alloc() debug check

On Fri, Nov 20, 2020 at 6:20 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Hi,
>
> On 11/20/20 1:54 AM, Daniel Vetter wrote:
> > diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
> > index d5ece7a9a403..f94405d43fd1 100644
> > --- a/include/linux/sched/mm.h
> > +++ b/include/linux/sched/mm.h
> > @@ -180,6 +180,22 @@ static inline void fs_reclaim_acquire(gfp_t gfp_mask) { }
> >  static inline void fs_reclaim_release(gfp_t gfp_mask) { }
> >  #endif
> >
> > +/**
> > + * might_alloc - Marks possible allocation sites
>
>                     Mark
>
> > + * @gfp_mask: gfp_t flags that would be use to allocate
>
>                                            used
>
> > + *
> > + * Similar to might_sleep() and other annotations this can be used in functions
>
>                                          annotations,
>
> > + * that might allocate, but often dont. Compiles to nothing without
>
>                                      don't.
>
> > + * CONFIG_LOCKDEP. Includes a conditional might_sleep() if @gfp allows blocking.
>
> ?                                            might_sleep_if() if

That's one if too many, I'll do the others for next round. Thanks for
taking a look.
-Daniel

>
> > + */
> > +static inline void might_alloc(gfp_t gfp_mask)
> > +{
> > +     fs_reclaim_acquire(gfp_mask);
> > +     fs_reclaim_release(gfp_mask);
> > +
> > +     might_sleep_if(gfpflags_allow_blocking(gfp_mask));
> > +}
>
>
> --
> ~Randy
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch