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Date: Sat, 24 Feb 2024 09:43:30 -0600
From: Alex Elder <elder@...e.org>
To: "Ricardo B. Marliere" <ricardo@...liere.net>,
Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: greybus-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] greybus: constify the struct device_type usage
On 2/19/24 6:40 AM, Ricardo B. Marliere wrote:
> Since commit aed65af1cc2f ("drivers: make device_type const"), the driver
> core can properly handle constant struct device_type. Move the
> greybus_hd_type, greybus_module_type, greybus_interface_type,
> greybus_control_type, greybus_bundle_type and greybus_svc_type variables to
> be constant structures as well, placing it into read-only memory which can
> not be modified at runtime.
>
> Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
This looks good to me. Assuming it compiles cleanly:
Reviewed-by: Alex Elder <elder@...aro.org>
On another subject:
Johan might disagree, but I think it would be nice to make
the definitions of the Greybus device types as static (private)
and make the is_gb_host_device() etc. functions real functions
rather than static inlines in <linux/greybus.h>.
It turns out that all of the is_gb_*() functions are called only
from drivers/greybus/core.c; they could all be moved there rather
than advertising them in <linux/greybus.h>.
-Alex
> ---
> drivers/greybus/bundle.c | 2 +-
> drivers/greybus/control.c | 2 +-
> drivers/greybus/hd.c | 2 +-
> drivers/greybus/interface.c | 2 +-
> drivers/greybus/module.c | 2 +-
> drivers/greybus/svc.c | 2 +-
> include/linux/greybus.h | 12 ++++++------
> 7 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/greybus/bundle.c b/drivers/greybus/bundle.c
> index 84660729538b..a6e1cca06172 100644
> --- a/drivers/greybus/bundle.c
> +++ b/drivers/greybus/bundle.c
> @@ -166,7 +166,7 @@ static const struct dev_pm_ops gb_bundle_pm_ops = {
> SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle)
> };
>
> -struct device_type greybus_bundle_type = {
> +const struct device_type greybus_bundle_type = {
> .name = "greybus_bundle",
> .release = gb_bundle_release,
> .pm = &gb_bundle_pm_ops,
> diff --git a/drivers/greybus/control.c b/drivers/greybus/control.c
> index 359a25841973..b5cf49d09df2 100644
> --- a/drivers/greybus/control.c
> +++ b/drivers/greybus/control.c
> @@ -436,7 +436,7 @@ static void gb_control_release(struct device *dev)
> kfree(control);
> }
>
> -struct device_type greybus_control_type = {
> +const struct device_type greybus_control_type = {
> .name = "greybus_control",
> .release = gb_control_release,
> };
> diff --git a/drivers/greybus/hd.c b/drivers/greybus/hd.c
> index 72b21bf2d7d3..e2f3496bddc3 100644
> --- a/drivers/greybus/hd.c
> +++ b/drivers/greybus/hd.c
> @@ -116,7 +116,7 @@ static void gb_hd_release(struct device *dev)
> kfree(hd);
> }
>
> -struct device_type greybus_hd_type = {
> +const struct device_type greybus_hd_type = {
> .name = "greybus_host_device",
> .release = gb_hd_release,
> };
> diff --git a/drivers/greybus/interface.c b/drivers/greybus/interface.c
> index 9ec949a438ef..a88dc701289c 100644
> --- a/drivers/greybus/interface.c
> +++ b/drivers/greybus/interface.c
> @@ -765,7 +765,7 @@ static const struct dev_pm_ops gb_interface_pm_ops = {
> gb_interface_runtime_idle)
> };
>
> -struct device_type greybus_interface_type = {
> +const struct device_type greybus_interface_type = {
> .name = "greybus_interface",
> .release = gb_interface_release,
> .pm = &gb_interface_pm_ops,
> diff --git a/drivers/greybus/module.c b/drivers/greybus/module.c
> index 36f77f9e1d74..7f7153a1dd60 100644
> --- a/drivers/greybus/module.c
> +++ b/drivers/greybus/module.c
> @@ -81,7 +81,7 @@ static void gb_module_release(struct device *dev)
> kfree(module);
> }
>
> -struct device_type greybus_module_type = {
> +const struct device_type greybus_module_type = {
> .name = "greybus_module",
> .release = gb_module_release,
> };
> diff --git a/drivers/greybus/svc.c b/drivers/greybus/svc.c
> index 0d7e749174a4..4256467fcd35 100644
> --- a/drivers/greybus/svc.c
> +++ b/drivers/greybus/svc.c
> @@ -1305,7 +1305,7 @@ static void gb_svc_release(struct device *dev)
> kfree(svc);
> }
>
> -struct device_type greybus_svc_type = {
> +const struct device_type greybus_svc_type = {
> .name = "greybus_svc",
> .release = gb_svc_release,
> };
> diff --git a/include/linux/greybus.h b/include/linux/greybus.h
> index 18c0fb958b74..5f9791fae3c0 100644
> --- a/include/linux/greybus.h
> +++ b/include/linux/greybus.h
> @@ -106,12 +106,12 @@ struct dentry *gb_debugfs_get(void);
>
> extern struct bus_type greybus_bus_type;
>
> -extern struct device_type greybus_hd_type;
> -extern struct device_type greybus_module_type;
> -extern struct device_type greybus_interface_type;
> -extern struct device_type greybus_control_type;
> -extern struct device_type greybus_bundle_type;
> -extern struct device_type greybus_svc_type;
> +extern const struct device_type greybus_hd_type;
> +extern const struct device_type greybus_module_type;
> +extern const struct device_type greybus_interface_type;
> +extern const struct device_type greybus_control_type;
> +extern const struct device_type greybus_bundle_type;
> +extern const struct device_type greybus_svc_type;
>
> static inline int is_gb_host_device(const struct device *dev)
> {
>
> ---
> base-commit: b401b621758e46812da61fa58a67c3fd8d91de0d
> change-id: 20240219-device_cleanup-greybus-c97c1ef52458
>
> Best regards,
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