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

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Date:   Fri, 20 Nov 2020 09:19:56 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Cc:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        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

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

> + */
> +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