linux-kernel - Re: [PATCH 07/23] mm: Introduce zap_details.zap

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Date:   Tue, 23 Mar 2021 11:43:21 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Jerome Glisse <jglisse@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>
Subject: Re: [PATCH 07/23] mm: Introduce zap_details.zap_flags

On Tue, Mar 23, 2021 at 02:11:29AM +0000, Matthew Wilcox wrote:
> On Mon, Mar 22, 2021 at 08:48:56PM -0400, Peter Xu wrote:
> > +/* Whether to check page->mapping when zapping */
> > +#define  ZAP_FLAG_CHECK_MAPPING             BIT(0)
> > +
> >  /*
> >   * Parameter block passed down to zap_pte_range in exceptional cases.
> >   */
> >  struct zap_details {
> > -	struct address_space *check_mapping;	/* Check page->mapping if set */
> > +	struct address_space *zap_mapping;	/* Check page->mapping if set */
> 
> Now the comment is wrong.  It used to mean "If this is NULL, zap pages
> with any mapping", but now it's always set, and the decision about whether
> to check the mapping is in the flag.
> 
> Honestly, I'd remove the comments from both these members.  They don't add
> anything to understandability now.

Agreed, I'm removing them.  Thanks,

-- 
Peter Xu