linux-kernel - [PATCH v6 3/5] virt: vmgenid: enable driver regardless of ACPI config

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Message-ID: <20240417104046.27253-4-bchalios@amazon.es>
Date: Wed, 17 Apr 2024 12:40:44 +0200
From: Babis Chalios <bchalios@...zon.es>
To: <tytso@....edu>, <Jason@...c4.com>, <olivia@...enic.com>,
	<herbert@...dor.apana.org.au>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <linux-crypto@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <sudanl@...zon.com>, <bchalios@...zon.es>, <graf@...zon.de>,
	<xmarcalx@...zon.co.uk>, <dwmw@...zon.co.uk>, Alexander Graf
	<graf@...zon.com>
Subject: [PATCH v6 3/5] virt: vmgenid: enable driver regardless of ACPI config

Since with next commits vmgenid driver will support both ACPI and
devicetree, and since either one of CONFIG_ACPI or CONFIG_OF will
always be enabled, there is no need for the driver compilation to
depend on ACPI/OF. So, remove ACPI dependency for compiling the driver.

Co-authored-by: Sudan Landge <sudanl@...zon.com>
Signed-off-by: Babis Chalios <bchalios@...zon.es>
Reviewed-by: Alexander Graf <graf@...zon.com>
---
 drivers/virt/Kconfig   |  1 -
 drivers/virt/vmgenid.c | 16 +++++++++++-----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/virt/Kconfig b/drivers/virt/Kconfig
index 40129b6f0eca..d8c848cf09a6 100644
--- a/drivers/virt/Kconfig
+++ b/drivers/virt/Kconfig
@@ -16,7 +16,6 @@ if VIRT_DRIVERS
 config VMGENID
 	tristate "Virtual Machine Generation ID driver"
 	default y
-	depends on ACPI
 	help
 	  Say Y here to use the hypervisor-provided Virtual Machine Generation ID
 	  to reseed the RNG when the VM is cloned. This is highly recommended if
diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c
index c028e2064fdd..3d93e3fb94c4 100644
--- a/drivers/virt/vmgenid.c
+++ b/drivers/virt/vmgenid.c
@@ -36,13 +36,15 @@ static void vmgenid_notify(struct device *device)
 	kobject_uevent_env(&device->kobj, KOBJ_CHANGE, envp);
 }
 
-static void vmgenid_acpi_handler(acpi_handle __always_unused handle,
-				 u32 __always_unused event, void *dev)
+static void __maybe_unused
+vmgenid_acpi_handler(acpi_handle __always_unused handle,
+		     u32 __always_unused event, void *dev)
 {
 	vmgenid_notify(dev);
 }
 
-static int setup_vmgenid_state(struct vmgenid_state *state, u8 *next_id)
+static int __maybe_unused
+setup_vmgenid_state(struct vmgenid_state *state, u8 *next_id)
 {
 	if (IS_ERR(next_id))
 		return PTR_ERR(next_id);
@@ -53,9 +55,10 @@ static int setup_vmgenid_state(struct vmgenid_state *state, u8 *next_id)
 	return 0;
 }
 
-static int vmgenid_add_acpi(struct device *dev,
-			    struct vmgenid_state *state)
+static int vmgenid_add_acpi(struct device __maybe_unused *dev,
+			    struct vmgenid_state __maybe_unused *state)
 {
+#if IS_ENABLED(CONFIG_ACPI)
 	struct acpi_device *device = ACPI_COMPANION(dev);
 	struct acpi_buffer parsed = { ACPI_ALLOCATE_BUFFER };
 	union acpi_object *obj;
@@ -98,6 +101,9 @@ static int vmgenid_add_acpi(struct device *dev,
 out:
 	ACPI_FREE(parsed.pointer);
 	return ret;
+#else
+	return -EINVAL;
+#endif
 }
 
 static int vmgenid_add(struct platform_device *pdev)
-- 
2.40.1