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

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Date:   Fri, 24 Jun 2022 12:59:28 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Marek Szyprowski <m.szyprowski@...sung.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 Fri, Jun 24, 2022 at 6:55 AM Mel Gorman <mgorman@...hsingularity.net> wrote:
...
> +#define pcp_spin_trylock_irqsave(ptr, flags)                           \
> +       pcpu_spin_trylock_irqsave(struct per_cpu_pages, lock, ptr, flags)
> +
...
> +       pcp = pcpu_spin_trylock_irqsave(struct per_cpu_pages, lock, zone->per_cpu_pageset, flags);

Why pcp_spin_trylock_irqsave() was added earlier but not used later?