On Tue, Jul 18, 2017 at 03:53:48PM -0500, Gustavo A. R. Silva wrote:
> Remove unnecessary static on local variables cpu_id_modulus and cpu_id.
> Such variables are 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. Also, there is a significant difference in the bss segment.
> This log is the output of the size command, before and after the code
> change:
>
> before:
>textdata bss dec hex filename
> 78689 15272 27808 121769 1dba9
> drivers/net/ethernet/cavium/liquidio/lio_main.o
>
> after:
>textdata bss dec hex filename
> 78667 15128 27680 121475 1da83
> drivers/net/ethernet/cavium/liquidio/lio_main.o
>
> Signed-off-by: Gustavo A. R. Silva
> ---
> drivers/net/ethernet/cavium/liquidio/lio_main.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c
> b/drivers/net/ethernet/cavium/liquidio/lio_main.c
> index 51583ae..1d8fefa 100644
> --- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
> +++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
> @@ -2544,8 +2544,8 @@ static inline int setup_io_queues(struct octeon_device
> *octeon_dev,
> {
> struct octeon_droq_ops droq_ops;
> struct net_device *netdev;
> - static int cpu_id;
> - static int cpu_id_modulus;
> + int cpu_id;
> + int cpu_id_modulus;
> struct octeon_droq *droq;
> struct napi_struct *napi;
> int q, q_no, retval = 0;
> --
> 2.5.0
>
Thanks.
Acked-by: Felix Manlunas
