mm: move vma_modify() and helpers to internal header

These are core VMA manipulation functions which invoke VMA splitting and
merging and should not be directly accessed from outside of mm/.

Link: https://lkml.kernel.org/r/5efde0c6342a8860d5ffc90b415f3989fd8ed0b2.1722251717.git.lorenzo.stoakes@oracle.comSigned-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Gow <davidgow@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kees Cook <kees@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Rae Moar <rmoar@google.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Pengfei Xu <pengfei.xu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -3279,66 +3279,6 @@ extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
 	unsigned long addr, unsigned long len, pgoff_t pgoff,
 	bool *need_rmap_locks);
 extern void exit_mmap(struct mm_struct *);
-struct vm_area_struct *vma_modify(struct vma_iterator *vmi,
-				  struct vm_area_struct *prev,
-				  struct vm_area_struct *vma,
-				  unsigned long start, unsigned long end,
-				  unsigned long vm_flags,
-				  struct mempolicy *policy,
-				  struct vm_userfaultfd_ctx uffd_ctx,
-				  struct anon_vma_name *anon_name);
-
-/* We are about to modify the VMA's flags. */
-static inline struct vm_area_struct
-*vma_modify_flags(struct vma_iterator *vmi,
-		  struct vm_area_struct *prev,
-		  struct vm_area_struct *vma,
-		  unsigned long start, unsigned long end,
-		  unsigned long new_flags)
-{
-	return vma_modify(vmi, prev, vma, start, end, new_flags,
-			  vma_policy(vma), vma->vm_userfaultfd_ctx,
-			  anon_vma_name(vma));
-}
-
-/* We are about to modify the VMA's flags and/or anon_name. */
-static inline struct vm_area_struct
-*vma_modify_flags_name(struct vma_iterator *vmi,
-		       struct vm_area_struct *prev,
-		       struct vm_area_struct *vma,
-		       unsigned long start,
-		       unsigned long end,
-		       unsigned long new_flags,
-		       struct anon_vma_name *new_name)
-{
-	return vma_modify(vmi, prev, vma, start, end, new_flags,
-			  vma_policy(vma), vma->vm_userfaultfd_ctx, new_name);
-}
-
-/* We are about to modify the VMA's memory policy. */
-static inline struct vm_area_struct
-*vma_modify_policy(struct vma_iterator *vmi,
-		   struct vm_area_struct *prev,
-		   struct vm_area_struct *vma,
-		   unsigned long start, unsigned long end,
-		   struct mempolicy *new_pol)
-{
-	return vma_modify(vmi, prev, vma, start, end, vma->vm_flags,
-			  new_pol, vma->vm_userfaultfd_ctx, anon_vma_name(vma));
-}
-
-/* We are about to modify the VMA's flags and/or uffd context. */
-static inline struct vm_area_struct
-*vma_modify_flags_uffd(struct vma_iterator *vmi,
-		       struct vm_area_struct *prev,
-		       struct vm_area_struct *vma,
-		       unsigned long start, unsigned long end,
-		       unsigned long new_flags,
-		       struct vm_userfaultfd_ctx new_ctx)
-{
-	return vma_modify(vmi, prev, vma, start, end, new_flags,
-			  vma_policy(vma), new_ctx, anon_vma_name(vma));
-}
 
 static inline int check_data_rlimit(unsigned long rlim,
 				    unsigned long new,

mm/internal.h

@@ -1244,6 +1244,67 @@ struct vm_area_struct *vma_merge_extend(struct vma_iterator *vmi,
 					struct vm_area_struct *vma,
 					unsigned long delta);
 
+struct vm_area_struct *vma_modify(struct vma_iterator *vmi,
+				  struct vm_area_struct *prev,
+				  struct vm_area_struct *vma,
+				  unsigned long start, unsigned long end,
+				  unsigned long vm_flags,
+				  struct mempolicy *policy,
+				  struct vm_userfaultfd_ctx uffd_ctx,
+				  struct anon_vma_name *anon_name);
+
+/* We are about to modify the VMA's flags. */
+static inline struct vm_area_struct
+*vma_modify_flags(struct vma_iterator *vmi,
+		  struct vm_area_struct *prev,
+		  struct vm_area_struct *vma,
+		  unsigned long start, unsigned long end,
+		  unsigned long new_flags)
+{
+	return vma_modify(vmi, prev, vma, start, end, new_flags,
+			  vma_policy(vma), vma->vm_userfaultfd_ctx,
+			  anon_vma_name(vma));
+}
+
+/* We are about to modify the VMA's flags and/or anon_name. */
+static inline struct vm_area_struct
+*vma_modify_flags_name(struct vma_iterator *vmi,
+		       struct vm_area_struct *prev,
+		       struct vm_area_struct *vma,
+		       unsigned long start,
+		       unsigned long end,
+		       unsigned long new_flags,
+		       struct anon_vma_name *new_name)
+{
+	return vma_modify(vmi, prev, vma, start, end, new_flags,
+			  vma_policy(vma), vma->vm_userfaultfd_ctx, new_name);
+}
+
+/* We are about to modify the VMA's memory policy. */
+static inline struct vm_area_struct
+*vma_modify_policy(struct vma_iterator *vmi,
+		   struct vm_area_struct *prev,
+		   struct vm_area_struct *vma,
+		   unsigned long start, unsigned long end,
+		   struct mempolicy *new_pol)
+{
+	return vma_modify(vmi, prev, vma, start, end, vma->vm_flags,
+			  new_pol, vma->vm_userfaultfd_ctx, anon_vma_name(vma));
+}
+
+/* We are about to modify the VMA's flags and/or uffd context. */
+static inline struct vm_area_struct
+*vma_modify_flags_uffd(struct vma_iterator *vmi,
+		       struct vm_area_struct *prev,
+		       struct vm_area_struct *vma,
+		       unsigned long start, unsigned long end,
+		       unsigned long new_flags,
+		       struct vm_userfaultfd_ctx new_ctx)
+{
+	return vma_modify(vmi, prev, vma, start, end, new_flags,
+			  vma_policy(vma), new_ctx, anon_vma_name(vma));
+}
+
 enum {
 	/* mark page accessed */
 	FOLL_TOUCH = 1 << 16,