mm/mmap: make vma_wants_writenotify return bool

vma_wants_writenotify() should return bool, so change it.

Link: https://lkml.kernel.org/r/20240407062653.803142-1-gehao@kylinos.cnSigned-off-by: Hao Ge <gehao@kylinos.cn>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -2575,7 +2575,7 @@ extern unsigned long move_page_tables(struct vm_area_struct *vma,
 					    MM_CP_UFFD_WP_RESOLVE)
 
 bool vma_needs_dirty_tracking(struct vm_area_struct *vma);
-int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
+bool vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
 static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma)
 {
 	/*

mm/mmap.c

@@ -1514,32 +1514,32 @@ bool vma_needs_dirty_tracking(struct vm_area_struct *vma)
  * to the private version (using protection_map[] without the
  * VM_SHARED bit).
  */
-int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot)
+bool vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot)
 {
 	/* If it was private or non-writable, the write bit is already clear */
 	if (!vma_is_shared_writable(vma))
-		return 0;
+		return false;
 
 	/* The backer wishes to know when pages are first written to? */
 	if (vm_ops_needs_writenotify(vma->vm_ops))
-		return 1;
+		return true;
 
 	/* The open routine did something to the protections that pgprot_modify
 	 * won't preserve? */
 	if (pgprot_val(vm_page_prot) !=
 	    pgprot_val(vm_pgprot_modify(vm_page_prot, vma->vm_flags)))
-		return 0;
+		return false;
 
 	/*
 	 * Do we need to track softdirty? hugetlb does not support softdirty
 	 * tracking yet.
 	 */
 	if (vma_soft_dirty_enabled(vma) && !is_vm_hugetlb_page(vma))
-		return 1;
+		return true;
 
 	/* Do we need write faults for uffd-wp tracking? */
 	if (userfaultfd_wp(vma))
-		return 1;
+		return true;
 
 	/* Can the mapping track the dirty pages? */
 	return vma_fs_can_writeback(vma);