On 09/20/2018 01:28 PM, Luca Coelho wrote:
> From: Luca Coelho <luciano.coelho@intel.com>
> 
> In kernel v4.19-rc1, the activate op in struct led_trigger, changed
> from void to int.  To solve this, add a semantic patch to insert a
> wrapper function that returns void and calls the function that returns
> int.
> 
> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
> ---
>  patches/led_activate.cocci | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 patches/led_activate.cocci
> 
> diff --git a/patches/led_activate.cocci b/patches/led_activate.cocci
> new file mode 100644
> index 000000000000..df8211d29462
> --- /dev/null
> +++ b/patches/led_activate.cocci
> @@ -0,0 +1,24 @@
> +@act@
> +identifier activate_fn, p;
> +identifier m =~ "rx_led|tx_led|assoc_led|radio_led|tpt_led";
> +fresh identifier activate_fn_wrap = "bp_" ## activate_fn;
> +@@
> +<...
> ++#if LINUX_VERSION_IS_GEQ(4,19,0)
> +p->m.activate = activate_fn;
> ++#else
> ++p->m.activate = activate_fn_wrap;
> ++#endif
> +...>

Please use <+--- ---+> here it improves the speed by some magnitudes.

> +
> +@@
> +identifier act.activate_fn;
> +identifier act.activate_fn_wrap;
> +@@
> +int activate_fn(...) {...}
> ++#if LINUX_VERSION_IS_LESS(4,19,0)
> ++static void activate_fn_wrap(struct led_classdev *led_cdev)
> ++{
> ++	activate_fn(led_cdev);
> ++}
> ++#endif
>