[PATCH 4/9] power: supply: axp20x_usb_power: Drop unnecessary static

Julia Lawall
2017-05-04T20:10:49Z

Drop static on a local variable, when the variable is either first
initialized or never used, 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
2865 252 8 3125 c35 drivers/power/supply/axp20x_usb_power.o

after:
text data bss dec hex filename
2822 252 0 3074 c02 drivers/power/supply/axp20x_usb_power.o

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

---
drivers/power/supply/axp20x_usb_power.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index 2397c48..44f70dc 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -339,7 +339,7 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
"VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
static const char * const axp22x_irq_names[] = {
"VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
- static const char * const *irq_names;
+ const char * const *irq_names;
const struct power_supply_desc *usb_power_desc;
int i, irq, ret;