mm/mmap: introduce vma_set_range()

There is a lot of code needs to set the range of vma in mmap.c, introduce
vma_set_range() to simplify the code.

Link: https://lkml.kernel.org/r/20240124035719.3685193-1-yajun.deng@linux.devSigned-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/internal.h

@@ -1114,6 +1114,15 @@ static inline bool gup_must_unshare(struct vm_area_struct *vma,
 extern bool mirrored_kernelcore;
 extern bool memblock_has_mirror(void);
 
+static __always_inline void vma_set_range(struct vm_area_struct *vma,
+					  unsigned long start, unsigned long end,
+					  pgoff_t pgoff)
+{
+	vma->vm_start = start;
+	vma->vm_end = end;
+	vma->vm_pgoff = pgoff;
+}
+
 static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
 {
 	/*

mm/mmap.c

@@ -663,9 +663,7 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
 
 	vma_prepare(&vp);
 	vma_adjust_trans_huge(vma, start, end, 0);
-	vma->vm_start = start;
-	vma->vm_end = end;
-	vma->vm_pgoff = pgoff;
+	vma_set_range(vma, start, end, pgoff);
 	vma_iter_store(vmi, vma);
 
 	vma_complete(&vp, vmi, vma->vm_mm);
@@ -708,9 +706,7 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
 	vma_adjust_trans_huge(vma, start, end, 0);
 
 	vma_iter_clear(vmi);
-	vma->vm_start = start;
-	vma->vm_end = end;
-	vma->vm_pgoff = pgoff;
+	vma_set_range(vma, start, end, pgoff);
 	vma_complete(&vp, vmi, vma->vm_mm);
 	return 0;
 }
@@ -1015,10 +1011,7 @@ static struct vm_area_struct
 
 	vma_prepare(&vp);
 	vma_adjust_trans_huge(vma, vma_start, vma_end, adj_start);
-
-	vma->vm_start = vma_start;
-	vma->vm_end = vma_end;
-	vma->vm_pgoff = vma_pgoff;
+	vma_set_range(vma, vma_start, vma_end, vma_pgoff);
 
 	if (vma_expanded)
 		vma_iter_store(vmi, vma);
@@ -2811,11 +2804,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 	}
 
 	vma_iter_config(&vmi, addr, end);
-	vma->vm_start = addr;
-	vma->vm_end = end;
+	vma_set_range(vma, addr, end, pgoff);
 	vm_flags_init(vma, vm_flags);
 	vma->vm_page_prot = vm_get_page_prot(vm_flags);
-	vma->vm_pgoff = pgoff;
 
 	if (file) {
 		vma->vm_file = get_file(file);
@@ -3165,9 +3156,7 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
 		goto unacct_fail;
 
 	vma_set_anonymous(vma);
-	vma->vm_start = addr;
-	vma->vm_end = addr + len;
-	vma->vm_pgoff = addr >> PAGE_SHIFT;
+	vma_set_range(vma, addr, addr + len, addr >> PAGE_SHIFT);
 	vm_flags_init(vma, flags);
 	vma->vm_page_prot = vm_get_page_prot(flags);
 	vma_start_write(vma);
@@ -3404,9 +3393,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
 		new_vma = vm_area_dup(vma);
 		if (!new_vma)
 			goto out;
-		new_vma->vm_start = addr;
-		new_vma->vm_end = addr + len;
-		new_vma->vm_pgoff = pgoff;
+		vma_set_range(new_vma, addr, addr + len, pgoff);
 		if (vma_dup_policy(vma, new_vma))
 			goto out_free_vma;
 		if (anon_vma_clone(new_vma, vma))
@@ -3574,9 +3561,7 @@ static struct vm_area_struct *__install_special_mapping(
 	if (unlikely(vma == NULL))
 		return ERR_PTR(-ENOMEM);
 
-	vma->vm_start = addr;
-	vma->vm_end = addr + len;
-
+	vma_set_range(vma, addr, addr + len, 0);
 	vm_flags_init(vma, (vm_flags | mm->def_flags |
 		      VM_DONTEXPAND | VM_SOFTDIRTY) & ~VM_LOCKED_MASK);
 	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);