linux-kernel - Re: [PATCH 3/5] mm: page_vma_mapped: support checking if a pfn is mapped into a vma

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Date:   Sun, 23 Jan 2022 23:36:49 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     dan.j.williams@...el.com, willy@...radead.org, jack@...e.cz,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        apopple@...dia.com, shy828301@...il.com, rcampbell@...dia.com,
        hughd@...gle.com, xiyuyang19@...an.edu.cn,
        kirill.shutemov@...ux.intel.com, zwisler@...nel.org,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/5] mm: page_vma_mapped: support checking if a pfn is
 mapped into a vma

On Fri, Jan 21, 2022 at 03:55:13PM +0800, Muchun Song wrote:
> +	if (pvmw->pte && ((pvmw->flags & PVMW_PFN_WALK) || !PageHuge(pvmw->page)))

Please avoid the overly long line here and in a few other places.

> +/*
> + * Then at what user virtual address will none of the page be found in vma?

Doesn't parse, what is this trying to say?