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

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Message-ID: <CAPY8ntAAYzYtESJpBBN0FPni178qjBn2x8-g0h1ROqzBXvzF9w@mail.gmail.com>
Date:   Fri, 18 Nov 2022 17:20:45 +0000
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Dan Carpenter <error27@...il.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
Subject: Re: [PATCH v2 1/3] Revert "staging: mmal-vchiq: Avoid use of bool in structures"

Hi Umang & Kieran

On Fri, 18 Nov 2022 at 10:21, Kieran Bingham
<kieran.bingham@...asonboard.com> wrote:
>
> 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.

If it were one of the structs in one of the mmal-msh*.h files, then
I'd worry about the firmware ABI. This is internal state solely on the
kernel side so it's fine.

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

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.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
> >