Received-SPF: pass (google.com: domain of linux-kernel+bounces-153895-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161;
Precedence: bulk
MIME-Version: 1.0
References: <20240418135412.14730-1-Jonathan.Cameron@huawei.com> <20240418135412.14730-8-Jonathan.Cameron@huawei.com>
In-Reply-To: <20240418135412.14730-8-Jonathan.Cameron@huawei.com>
From: "Rafael J. Wysocki" <rafael@kernel.org>
Date: Mon, 22 Apr 2024 21:05:44 +0200
Message-ID: <CAJZ5v0jOoH7nP-5uaK9XVL_zf7Uh5SZnoupRyxK1qxwUdwq_dA@mail.gmail.com>
Subject: Re: [PATCH v7 07/16] ACPI: scan: switch to flags for acpi_scan_check_and_detach()
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>, linux-pm@vger.kernel.org, 
	loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, 
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, 
	Russell King <linux@armlinux.org.uk>, "Rafael J . Wysocki" <rafael@kernel.org>, 
	Miguel Luis <miguel.luis@oracle.com>, James Morse <james.morse@arm.com>, 
	Salil Mehta <salil.mehta@huawei.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, 
	Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, 
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, 
	Dave Hansen <dave.hansen@linux.intel.com>, linuxarm@huawei.com, justin.he@arm.com, 
	jianyong.wu@arm.com
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Thu, Apr 18, 2024 at 3:57=E2=80=AFPM Jonathan Cameron
<Jonathan.Cameron@huawei.com> wrote:
>
> Precursor patch adds the ability to pass a uintptr_t of flags into
> acpi_scan_check_and detach() so that additional flags can be
> added to indicate whether to defer portions of the eject flow.
> The new flag follows in the next patch.
>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

I have no specific heartburn related to this, so

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
> v7: No change
> v6: Based on internal feedback switch to less invasive change
>     to using flags rather than a struct.
> ---
>  drivers/acpi/scan.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index d1464324de95..1ec9677e6c2d 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -244,13 +244,16 @@ static int acpi_scan_try_to_offline(struct acpi_dev=
ice *device)
>         return 0;
>  }
>
> -static int acpi_scan_check_and_detach(struct acpi_device *adev, void *ch=
eck)
> +#define ACPI_SCAN_CHECK_FLAG_STATUS    BIT(0)
> +
> +static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p)
>  {
>         struct acpi_scan_handler *handler =3D adev->handler;
> +       uintptr_t flags =3D (uintptr_t)p;
>
> -       acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach,=
 check);
> +       acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach,=
 p);
>
> -       if (check) {
> +       if (flags & ACPI_SCAN_CHECK_FLAG_STATUS) {
>                 acpi_bus_get_status(adev);
>                 /*
>                  * Skip devices that are still there and take the enabled
> @@ -288,7 +291,9 @@ static int acpi_scan_check_and_detach(struct acpi_dev=
ice *adev, void *check)
>
>  static void acpi_scan_check_subtree(struct acpi_device *adev)
>  {
> -       acpi_scan_check_and_detach(adev, (void *)true);
> +       uintptr_t flags =3D ACPI_SCAN_CHECK_FLAG_STATUS;
> +
> +       acpi_scan_check_and_detach(adev, (void *)flags);
>  }
>
>  static int acpi_scan_hot_remove(struct acpi_device *device)
> @@ -2601,7 +2606,9 @@ EXPORT_SYMBOL(acpi_bus_scan);
>   */
>  void acpi_bus_trim(struct acpi_device *adev)
>  {
> -       acpi_scan_check_and_detach(adev, NULL);
> +       uintptr_t flags =3D 0;
> +
> +       acpi_scan_check_and_detach(adev, (void *)flags);
>  }
>  EXPORT_SYMBOL_GPL(acpi_bus_trim);
>
> --