mm: use ERR_CAST

Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)).  The former makes more
clear what is the purpose of the operation, which otherwise looks like a
no-op.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
T x;
identifier f;
@@

T f (...) { <+...
- ERR_PTR(PTR_ERR(x))
+ x
 ...+> }

@@
expression x;
@@

- ERR_PTR(PTR_ERR(x))
+ ERR_CAST(x)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b7e314b1009f62e8c723064fc28b4e7a1528e275..8b5e4370540be67f1abcb2cc884a3ce82f46bf1a 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -732,7 +732,7 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
                                        node, gfp_mask);
        if (unlikely(IS_ERR(va))) {
                kfree(vb);
-               return ERR_PTR(PTR_ERR(va));
+               return ERR_CAST(va);
        }
 
        err = radix_tree_preload(gfp_mask);