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Howlett" __vma_link_file() resolves the mapping from the file, if there is one. Pass through the mapping and check the vm_file externally since most places already have the required information and check of vm_file. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 5070af64b99d..fbe8b52a90a3 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -407,21 +407,15 @@ static unsigned long count_vma_pages_range(struct mm_= struct *mm, return nr_pages; } =20 -static void __vma_link_file(struct vm_area_struct *vma) +static void __vma_link_file(struct vm_area_struct *vma, + struct address_space *mapping) { - struct file *file; - - file =3D vma->vm_file; - if (file) { - struct address_space *mapping =3D file->f_mapping; - - if (vma->vm_flags & VM_SHARED) - mapping_allow_writable(mapping); + if (vma->vm_flags & VM_SHARED) + mapping_allow_writable(mapping); =20 - flush_dcache_mmap_lock(mapping); - vma_interval_tree_insert(vma, &mapping->i_mmap); - flush_dcache_mmap_unlock(mapping); - } + flush_dcache_mmap_lock(mapping); + vma_interval_tree_insert(vma, &mapping->i_mmap); + flush_dcache_mmap_unlock(mapping); } =20 /* @@ -488,10 +482,11 @@ static int vma_link(struct mm_struct *mm, struct vm_a= rea_struct *vma) } =20 vma_mas_store(vma, &mas); - __vma_link_file(vma); =20 - if (mapping) + if (mapping) { + __vma_link_file(vma, mapping); i_mmap_unlock_write(mapping); + } =20 mm->map_count++; validate_mm(mm); @@ -730,14 +725,14 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned= long start, uprobe_munmap(next, next->vm_start, next->vm_end); =20 i_mmap_lock_write(mapping); - if (insert) { + if (insert && insert->vm_file) { /* * Put into interval tree now, so instantiated pages * are visible to arm/parisc __flush_dcache_page * throughout; but we cannot insert into address * space until vma start or end is updated. */ - __vma_link_file(insert); + __vma_link_file(insert, insert->vm_file->f_mapping); } } =20 --=20 2.35.1