linux-kernel - Re: [PATCH v2 5/5] ACPI: Drop parent field from struct acpi

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Message-ID: <a0cab176-3c3a-707a-02c3-74ffc1b4926e@huawei.com>
Date:   Sat, 27 Aug 2022 21:19:33 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Mark Brown <broonie@...nel.org>,
        "Andreas Noever" <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        <linux-hyperv@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>, "Will Deacon" <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Konrad Dybcio" <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH v2 5/5] ACPI: Drop parent field from struct acpi_device

Hi Rafael,

On 2022/8/25 0:59, Rafael J. Wysocki wrote:
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -365,7 +365,6 @@ struct acpi_device {
>   	int device_type;
>   	acpi_handle handle;		/* no handle for fixed hardware */
>   	struct fwnode_handle fwnode;
> -	struct acpi_device *parent;
>   	struct list_head wakeup_list;
>   	struct list_head del_list;
>   	struct acpi_device_status status;
> @@ -458,6 +457,14 @@ static inline void *acpi_driver_data(str
>   #define to_acpi_device(d)	container_of(d, struct acpi_device, dev)
>   #define to_acpi_driver(d)	container_of(d, struct acpi_driver, drv)
>   
> +static inline struct acpi_device *acpi_dev_parent(struct acpi_device *adev)
> +{
> +	if (adev->dev.parent)
> +		return to_acpi_device(adev->dev.parent);
> +
> +	return NULL;
> +}
> +
>   static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
>   {
>   	*((u32 *)&adev->status) = sta;
> @@ -478,6 +485,7 @@ void acpi_initialize_hp_context(struct a
>   /* acpi_device.dev.bus == &acpi_bus_type */
>   extern struct bus_type acpi_bus_type;
>   
> +struct acpi_device *acpi_dev_parent(struct acpi_device *adev);

We have a static inline function above, is it duplicated here?
Or did I miss some use cases?

Thanks
Hanjun