Re: [PATCH] msi-wmi: remove unnecessary static in msi_wmi_notify()

From: Andy Shevchenko
Date: Wed Jul 19 2017 - 14:11:46 EST


On Wed, Jul 19, 2017 at 12:49 AM, Gustavo A. R. Silva
<gustavo@xxxxxxxxxxxxxx> wrote:
> Remove unnecessary static on local variable _key_. 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:
> https://github.com/GustavoARSilva/coccinelle/blob/master/static/static_unused.cocci
>
> 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:
> text data bss dec hex filename
> 6530 3736 320 10586 295a drivers/platform/x86/msi-wmi.o
>
> after:
> text data bss dec hex filename
> 6494 3648 256 10398 289e drivers/platform/x86/msi-wmi.o
>

Pushed to testing, thanks.

P.S. Please, use subsystem prefix next time.

> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
> ---
> drivers/platform/x86/msi-wmi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
> index f6209b7..6201382 100644
> --- a/drivers/platform/x86/msi-wmi.c
> +++ b/drivers/platform/x86/msi-wmi.c
> @@ -184,7 +184,7 @@ static const struct backlight_ops msi_backlight_ops = {
> static void msi_wmi_notify(u32 value, void *context)
> {
> struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
> - static struct key_entry *key;
> + struct key_entry *key;
> union acpi_object *obj;
> acpi_status status;
>
> --
> 2.5.0
>



--
With Best Regards,
Andy Shevchenko