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Keep the inode open-for-write check, since even if collapse_file() now makes sure all to-be-collapsed folios are clean and the created PMD file THP can be handled by FSes properly, the filemap_flush() could perform undesirable write back. Signed-off-by: Zi Yan --- mm/huge_memory.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2f3fcb4dd1ef8..3b324f03e9283 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -86,9 +86,6 @@ static inline bool file_thp_enabled(struct vm_area_struct *vma) { struct inode *inode; - if (!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) - return false; - if (!vma->vm_file) return false; @@ -97,6 +94,9 @@ static inline bool file_thp_enabled(struct vm_area_struct *vma) if (IS_ANON_FILE(inode)) return false; + if (!mapping_pmd_folio_support(vma->vm_file->f_mapping)) + return false; + return !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); } -- 2.53.0