linux-kernel - Re: [PATCH 7/7] mm/page_alloc: Replace local

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Date:   Wed, 15 Jun 2022 16:43:03 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 7/7] mm/page_alloc: Replace local_lock with normal spinlock

On Mon, Jun 13, 2022 at 8:54 AM Mel Gorman <mgorman@...hsingularity.net> wrote:
...

> +#define pcpu_spin_trylock_irqsave(type, member, ptr, flags)            \
> +({                                                                     \
> +       type *_ret;                                                     \
> +       pcpu_task_pin();                                                \
> +       _ret = this_cpu_ptr(ptr);                                       \
> +       if (!spin_trylock_irqsave(&_ret->member, flags))                \
> +               _ret = NULL;                                            \

I'm getting "BUG: sleeping function called from invalid context" with
mm-everything-2022-06-14-19-05.

Perhaps missing a pcpu_task_unpin() here?

> +       _ret;                                                           \
> +})