From: Matthew Wilcox <willy@infradead.org>
To: Muchun Song <songmuchun@bytedance.com>
Cc: dan.j.williams@intel.com, jack@suse.cz, viro@zeniv.linux.org.uk,
akpm@linux-foundation.org, apopple@nvidia.com,
shy828301@gmail.com, rcampbell@nvidia.com, hughd@google.com,
xiyuyang19@fudan.edu.cn, kirill.shutemov@linux.intel.com,
zwisler@kernel.org, hch@infradead.org,
linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
duanxiongchun@bytedance.com
Subject: Re: [PATCH v2 3/6] mm: page_vma_mapped: support checking if a pfn is mapped into a vma
Date: Wed, 2 Feb 2022 18:28:26 +0000 [thread overview]
Message-ID: <YfrNSvttbQgLKKwj@casper.infradead.org> (raw)
In-Reply-To: <20220202143307.96282-4-songmuchun@bytedance.com>
On Wed, Feb 02, 2022 at 10:33:04PM +0800, Muchun Song wrote:
> page_vma_mapped_walk() is supposed to check if a page is mapped into a vma.
> However, not all page frames (e.g. PFN_DEV) have a associated struct page
> with it. There is going to be some duplicate codes similar with this function
> if someone want to check if a pfn (without a struct page) is mapped into a
> vma. So add support for checking if a pfn is mapped into a vma. In the next
> patch, the dax will use this new feature.
I'm coming to more or less the same solution for fixing the bug in
page_mapped_in_vma(). If you call it with a head page, it will look
for any page in the THP instead of the precise page. I think we can do
a fairly significant simplification though, so I'm going to go off
and work on that next ...
next prev parent reply other threads:[~2022-02-02 18:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-02 14:33 [PATCH v2 0/6] Fix some bugs related to ramp and dax Muchun Song
2022-02-02 14:33 ` [PATCH v2 1/6] mm: rmap: fix cache flush on THP pages Muchun Song
2022-02-03 10:16 ` Jan Kara
2022-02-02 14:33 ` [PATCH v2 2/6] dax: fix cache flush on PMD-mapped pages Muchun Song
2022-02-03 10:17 ` Jan Kara
2022-02-02 14:33 ` [PATCH v2 3/6] mm: page_vma_mapped: support checking if a pfn is mapped into a vma Muchun Song
2022-02-02 16:43 ` kernel test robot
2022-02-02 18:28 ` Matthew Wilcox [this message]
2022-02-03 0:18 ` kernel test robot
2022-02-03 0:18 ` kernel test robot
2022-02-02 14:33 ` [PATCH v2 4/6] mm: rmap: introduce pfn_mkclean_range() to cleans PTEs Muchun Song
2022-02-02 14:33 ` [PATCH v2 5/6] dax: fix missing writeprotect the pte entry Muchun Song
2022-02-02 14:33 ` [PATCH v2 6/6] mm: remove range parameter from follow_invalidate_pte() Muchun Song
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