linux-kernel - Re: [PATCH] mm/hugetlb: avoid get wrong ptep caused by race

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Date:   Tue, 18 Feb 2020 12:52:39 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Longpeng(Mike)" <longpeng2@...wei.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        arei.gonglei@...wei.com, weidong.huang@...wei.com,
        weifuqiang@...wei.com, kvm@...r.kernel.org
Subject: Re: [PATCH] mm/hugetlb: avoid get wrong ptep caused by race

On Tue, Feb 18, 2020 at 08:10:25PM +0800, Longpeng(Mike) wrote:
>  {
> -	pgd_t *pgd;
> -	p4d_t *p4d;
> -	pud_t *pud;
> -	pmd_t *pmd;
> +	pgd_t *pgdp;
> +	p4d_t *p4dp;
> +	pud_t *pudp, pud;
> +	pmd_t *pmdp, pmd;

Renaming the variables as part of a fix is a really bad idea.  It obscures
the actual fix and makes everybody's life harder.  Plus, it's not even
renaming to follow the normal convention -- there are only two places
(migrate.c and gup.c) which follow this pattern in mm/ while there are
33 that do not.