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c453d8c7d1
IIUC page_vma_mapped_walk() checks if the vma is possibly huge PMD mapped with transparent_hugepage_active() and "pvmw->nr_pages >= HPAGE_PMD_NR". Actually pvmw->nr_pages is returned by compound_nr() or folio_nr_pages(), so the page should be THP as long as "pvmw->nr_pages >= HPAGE_PMD_NR". And it is guaranteed THP is allocated for valid VMA in the first place. But it may be not PMD mapped if the VMA is file VMA and it is not properly aligned. The transhuge_vma_suitable() is used to do such check, so replace transparent_hugepage_active() to it, which is too heavy and overkilling. Link: https://lkml.kernel.org/r/20220513191705.457775-1-shy828301@gmail.com Signed-off-by: Yang Shi <shy828301@gmail.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.