On Mon, 17 Jul 2017, Gustavo A. R. Silva wrote:
> Remove unnecessary static on local variable twl4030_irq_chip.
> Such variable is initialized before being used, on every
> execution path throughout the function. The static has no
> benefit and, removing it reduces the object file size.
>
> This issue was detected using Coccinelle and the following semantic patch:
>
> @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;
>
> In the following log you can see a significant difference in the object
> file size. This log is the output of the size command, before and after
> the code change:
>
> before:
> text data bss dec hex filename
> 7076 2400 640 10116 2784 drivers/mfd/twl4030-irq.o
>
> after:
> text data bss dec hex filename
> 7119 2344 320 9783 2637 drivers/mfd/twl4030-irq.o
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
> ---
> drivers/mfd/twl4030-irq.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
Applied, thanks.
> diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
> index 378c02d..65d5500 100644
> --- a/drivers/mfd/twl4030-irq.c
> +++ b/drivers/mfd/twl4030-irq.c
> @@ -685,7 +685,7 @@ int twl4030_sih_setup(struct device *dev, int module, int irq_base)
>
> int twl4030_init_irq(struct device *dev, int irq_num)
> {
> - static struct irq_chip twl4030_irq_chip;
> + struct irq_chip twl4030_irq_chip;
> int status, i;
> int irq_base, irq_end, nr_irqs;
> struct device_node *node = dev->of_node;
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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