linux-kernel - Re: [PATCH 4/5] dax: fix missing writeprotect the pte entry

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Date:   Sun, 23 Jan 2022 23:41:41 -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 4/5] dax: fix missing writeprotect the pte entry

On Fri, Jan 21, 2022 at 03:55:14PM +0800, Muchun Song wrote:
> Reuse some infrastructure of page_mkclean_one() to let DAX can handle
> similar case to fix this issue.

Can you split out some of the infrastructure changes into proper
well-documented preparation patches?

> +	pgoff_t pgoff_end = pgoff_start + npfn - 1;
>  
>  	i_mmap_lock_read(mapping);
> -	vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) {
> -		struct mmu_notifier_range range;
> -		unsigned long address;
> -
> +	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff_start, pgoff_end) {

Please avoid the overly long lines here.  Just using start and end
might be an easy option.