[PATCH v4 01/14] proc: Refactor pde_get_unmapped_area as prep

[Rick Edgecombe <rick.p.edgecombe@intel.com>]

Future changes will perform a treewide change to remove the indirect
branch that is involved in calling mm->get_unmapped_area(). After doing
this, the function will no longer be able to be handled as a function
pointer. To make the treewide change diff cleaner and easier to review,
refactor pde_get_unmapped_area() such that mm->get_unmapped_area() is
called without being stored in a local function pointer. With this in
refactoring, follow on changes will be able to simply replace the call
site with a future function that calls it directly.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
v4:
 - New patch split from "mm: Switch mm->get_unmapped_area() to a flag"
   (Christophe Leroy)
---
 fs/proc/inode.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index dcd513dccf55..75396a24fd8c 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -451,15 +451,12 @@ pde_get_unmapped_area(struct proc_dir_entry *pde, struct file *file, unsigned lo
 			   unsigned long len, unsigned long pgoff,
 			   unsigned long flags)
 {
-	typeof_member(struct proc_ops, proc_get_unmapped_area) get_area;
+	if (pde->proc_ops->proc_get_unmapped_area)
+		return pde->proc_ops->proc_get_unmapped_area(file, orig_addr, len, pgoff, flags);
 
-	get_area = pde->proc_ops->proc_get_unmapped_area;
 #ifdef CONFIG_MMU
-	if (!get_area)
-		get_area = current->mm->get_unmapped_area;
+	return current->mm->get_unmapped_area(file, orig_addr, len, pgoff, flags);
 #endif
-	if (get_area)
-		return get_area(file, orig_addr, len, pgoff, flags);
 	return orig_addr;
 }
 
-- 
2.34.1