[PATCH 1/9] mtd: cfi_cmdset_0020: Drop unnecessary static

Julia Lawall
2017-05-04T20:10:46Z

Drop static on a local variable, when the variable is initialized before
any use on every possible execution path through the function. The static
has no benefit, and dropping it reduces the code size.

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

// <smpl>
@bad exists@
position p;
identifier x;
type T;
@@

static T x@p;
...
x = <+...x...+>

@@
identifier x;
expression e;
type T;
position p != bad.p;
@@

-static
T x@p;
... when != x
when strict
?x = e;
// </smpl>

The change in code size is indicates by the following output from the size
command.

before:
text data bss dec hex filename
16671 48 16 16735 415f drivers/mtd/chips/cfi_cmdset_0020.o

after:
text data bss dec hex filename
16639 48 8 16695 4137 drivers/mtd/chips/cfi_cmdset_0020.o

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
drivers/mtd/chips/cfi_cmdset_0020.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index 94d3eb4..7d34296 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -666,7 +666,7 @@ static int cfi_staa_write_buffers (struct mtd_info *mtd, loff_t to,
size_t totlen = 0, thislen;
int ret = 0;
size_t buflen = 0;
- static char *buffer;
+ char *buffer;

if (!ECCBUF_SIZE) {
/* We should fall back to a general writev implementation.