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mm: correct stale comment of function check_pte

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Commit 2aff7a4755bed ("mm: Convert page_vma_mapped_walk to work on PFNs")
replaced page with pfns in page_vma_mapped_walk structure and updated
"@pvmw->page" to "@pvmw->pfn" in comment of function page_vma_mapped_walk.

This patch update stale "page" to "pfn" in comment of check_pte.

Link: https://lkml.kernel.org/r/20230707153953.1380615-1-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-07-07 23:39:53 +08:00 committed by Andrew Morton
parent b4fa966f03
commit 9651eeab3c
1 changed files with 7 additions and 5 deletions
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12
mm/page_vma_mapped.c
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@ -73,20 +73,22 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw, spinlock_t **ptlp)
}
/**
* check_pte - check if @pvmw->page is mapped at the @pvmw->pte
* @pvmw: page_vma_mapped_walk struct, includes a pair pte and page for checking
* check_pte - check if [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages) is
* mapped at the @pvmw->pte
* @pvmw: page_vma_mapped_walk struct, includes a pair pte and pfn range
* for checking
*
* page_vma_mapped_walk() found a place where @pvmw->page is *potentially*
* page_vma_mapped_walk() found a place where pfn range is *potentially*
* mapped. check_pte() has to validate this.
*
* pvmw->pte may point to empty PTE, swap PTE or PTE pointing to
* arbitrary page.
*
* If PVMW_MIGRATION flag is set, returns true if @pvmw->pte contains migration
* entry that points to @pvmw->page or any subpage in case of THP.
* entry that points to [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages)
*
* If PVMW_MIGRATION flag is not set, returns true if pvmw->pte points to
* pvmw->page or any subpage in case of THP.
* [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages)
*
* Otherwise, return false.
*