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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To: Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra
	<peterz@infradead.org>, <linux-pm@vger.kernel.org>,
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	<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>, Marc Zyngier
	<maz@kernel.org>, Hanjun Guo <guohanjun@huawei.com>, Gavin Shan
	<gshan@redhat.com>
CC: 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>
Subject: [PATCH v9 09/19] ACPI: scan: switch to flags for acpi_scan_check_and_detach()
Date: Tue, 30 Apr 2024 15:24:24 +0100
Message-ID: <20240430142434.10471-10-Jonathan.Cameron@huawei.com>
In-Reply-To: <20240430142434.10471-1-Jonathan.Cameron@huawei.com>
References: <20240430142434.10471-1-Jonathan.Cameron@huawei.com>
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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.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Tested-by: Miguel Luis <miguel.luis@oracle.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

---
v9: No change
---
 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 7c157bf92695..fb5427caf0f4 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -244,13 +244,16 @@ static int acpi_scan_try_to_offline(struct acpi_device *device)
 	return 0;
 }
 
-static int acpi_scan_check_and_detach(struct acpi_device *adev, void *check)
+#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 = adev->handler;
+	uintptr_t flags = (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_device *adev, void *check)
 
 static void acpi_scan_check_subtree(struct acpi_device *adev)
 {
-	acpi_scan_check_and_detach(adev, (void *)true);
+	uintptr_t flags = ACPI_SCAN_CHECK_FLAG_STATUS;
+
+	acpi_scan_check_and_detach(adev, (void *)flags);
 }
 
 static int acpi_scan_hot_remove(struct acpi_device *device)
@@ -2600,7 +2605,9 @@ EXPORT_SYMBOL(acpi_bus_scan);
  */
 void acpi_bus_trim(struct acpi_device *adev)
 {
-	acpi_scan_check_and_detach(adev, NULL);
+	uintptr_t flags = 0;
+
+	acpi_scan_check_and_detach(adev, (void *)flags);
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
-- 
2.39.2