linux-kernel - Re: [PATCH v2 1/3] Revert "staging: mmal-vchiq: Avoid use of bool in structures"

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Message-ID: <166876686476.50677.13666680068580068271@Monstersaurus>
Date:   Fri, 18 Nov 2022 10:21:04 +0000
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Dan Carpenter <error27@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Ray Jui <rjui@...adcom.com>,
        Umang Jain <umang.jain@...asonboard.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev
Cc:     Umang Jain <umang.jain@...asonboard.com>
Subject: Re: [PATCH v2 1/3] Revert "staging: mmal-vchiq: Avoid use of bool in structures"

Quoting Umang Jain (2022-11-18 08:42:42)
> This reverts commit 640e77466e69d9c28de227bc76881f5501f532ca.
> 
> In commit 7967656ffbfa ("coding-style: Clarify the expectations around
> bool") the check to dis-allow bool structure members was removed from
> checkpatch.pl. It promotes bool structure members to store boolean
> values. This enhances code readability.
> 
> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>

Thanks,

That's a more direct revert of 640e77466e69 ("staging: mmal-vchiq: Avoid
use of bool in structures") indeed.

I see Stefan was concerned about clarifying that this won't affect
firmware or userspace, it may still be good to hear from Dave to
confirm, but my understanding of 640e77466e69, means I believe this is
safe. I don't expect this structure to be used as any kind of ABI to
firmware or userspace.

Reviewed-by: Kieran Bingham <kieran.bingham@...asonboard.com>


> ---
>  .../staging/vc04_services/vchiq-mmal/mmal-vchiq.c    | 12 ++++++------
>  .../staging/vc04_services/vchiq-mmal/mmal-vchiq.h    |  4 ++--
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> index cb921c94996a..4abb6178cb9f 100644
> --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
> @@ -863,9 +863,9 @@ static int port_info_get(struct vchiq_mmal_instance *instance,
>                 goto release_msg;
>  
>         if (rmsg->u.port_info_get_reply.port.is_enabled == 0)
> -               port->enabled = 0;
> +               port->enabled = false;
>         else
> -               port->enabled = 1;
> +               port->enabled = true;
>  
>         /* copy the values out of the message */
>         port->handle = rmsg->u.port_info_get_reply.port_handle;
> @@ -1304,7 +1304,7 @@ static int port_disable(struct vchiq_mmal_instance *instance,
>         if (!port->enabled)
>                 return 0;
>  
> -       port->enabled = 0;
> +       port->enabled = false;
>  
>         ret = port_action_port(instance, port,
>                                MMAL_MSG_PORT_ACTION_TYPE_DISABLE);
> @@ -1359,7 +1359,7 @@ static int port_enable(struct vchiq_mmal_instance *instance,
>         if (ret)
>                 goto done;
>  
> -       port->enabled = 1;
> +       port->enabled = true;
>  
>         if (port->buffer_cb) {
>                 /* send buffer headers to videocore */
> @@ -1531,7 +1531,7 @@ int vchiq_mmal_port_connect_tunnel(struct vchiq_mmal_instance *instance,
>                         pr_err("failed disconnecting src port\n");
>                         goto release_unlock;
>                 }
> -               src->connected->enabled = 0;
> +               src->connected->enabled = false;
>                 src->connected = NULL;
>         }
>  
> @@ -1799,7 +1799,7 @@ int vchiq_mmal_component_disable(struct vchiq_mmal_instance *instance,
>  
>         ret = disable_component(instance, component);
>         if (ret == 0)
> -               component->enabled = 0;
> +               component->enabled = false;
>  
>         mutex_unlock(&instance->vchiq_mutex);
>  
> diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
> index 6006e29232b3..6d984cf5a83a 100644
> --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
> +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
> @@ -48,7 +48,7 @@ typedef void (*vchiq_mmal_buffer_cb)(
>                 int status, struct mmal_buffer *buffer);
>  
>  struct vchiq_mmal_port {
> -       u32 enabled:1;
> +       bool enabled;
>         u32 handle;
>         u32 type; /* port type, cached to use on port info set */
>         u32 index; /* port index, cached to use on port info set */
> @@ -83,7 +83,7 @@ struct vchiq_mmal_port {
>  
>  struct vchiq_mmal_component {
>         u32 in_use:1;
> -       u32 enabled:1;
> +       bool enabled;
>         u32 handle;  /* VideoCore handle for component */
>         u32 inputs;  /* Number of input ports */
>         u32 outputs; /* Number of output ports */
> -- 
> 2.38.1
>