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

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Date:   Wed, 24 Aug 2022 20:34:28 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        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 on Hyper-V List <linux-hyperv@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <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

On Wed, Aug 24, 2022 at 8:23 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Wed, Aug 24, 2022 at 8:13 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> >
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > The parent field in struct acpi_device is, in fact, redundant,
> > because the dev.parent field in it effectively points to the same
> > object and it is used by the driver core.
> >
> > Accordingly, the parent field can be dropped from struct acpi_device
> > and for this purpose define acpi_dev_parent() to retrieve a parent
> > struct acpi_device pointer from the dev.parent field in struct
> > acpi_device.  Next, update all of the users of the parent field
> > in struct acpi_device to use acpi_dev_parent() instead of it and
> > drop it.
> >
> > While at it, drop the ACPI_IS_ROOT_DEVICE() macro that is only used
> > in one place in a confusing way.
> >
> > No intentional functional impact.
>
> Side note: Should we not convert these to use acpi_dev_parent()?
>
> https://elixir.bootlin.com/linux/v6.0-rc2/source/drivers/acpi/property.c#L1271
> https://elixir.bootlin.com/linux/v6.0-rc2/source/drivers/bus/hisi_lpc.c#L397

That can be done later, but thanks for the pointers!