linux-kernel - [RFC Patch 05/19] ACPI: Provide union for address_space64 and ext_address

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Date:	Thu,  8 Jan 2015 10:32:52 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>
Cc:	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Jiang Liu <jiang.liu@...ux.intel.com>,
	devel@...ica.org
Subject: [RFC Patch 05/19] ACPI: Provide union for address_space64 and ext_address_space64

From: Thomas Gleixner <tglx@...utronix.de>

address_space64 and ext_address_space64 share substracts just at
different offsets. To unify the parsing functions implement the two
structs as unions of their substructs, so we can extract the shared
data.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 include/acpi/acrestyp.h |   49 ++++++++++++++++++++++++++++++++++-------------
 1 file changed, 36 insertions(+), 13 deletions(-)

diff --git a/include/acpi/acrestyp.h b/include/acpi/acrestyp.h
index eb760ca0b2e0..307d5b2605c8 100644
--- a/include/acpi/acrestyp.h
+++ b/include/acpi/acrestyp.h
@@ -326,23 +326,46 @@ struct acpi_resource_address32 {
 	struct acpi_resource_source resource_source;
 };
 
-struct acpi_resource_address64 {
-	ACPI_RESOURCE_ADDRESS_COMMON u64 granularity;
-	u64 minimum;
-	u64 maximum;
-	u64 translation_offset;
+#define ACPI_RESOURCE_ADDRESS64_COMMON \
+	u64 granularity;	       \
+	u64 minimum;		       \
+	u64 maximum;		       \
+	u64 translation_offset;	       \
 	u64 address_length;
-	struct acpi_resource_source resource_source;
+
+struct acpi_resource_address64_common {
+ACPI_RESOURCE_ADDRESS64_COMMON};
+
+struct acpi_resource_address64 {
+	union {
+		struct {
+			ACPI_RESOURCE_ADDRESS_COMMON
+			ACPI_RESOURCE_ADDRESS64_COMMON
+			struct acpi_resource_source resource_source;
+		};
+		struct {
+			struct acpi_resource_address base;
+			struct acpi_resource_address64_common addr;
+			struct acpi_resource_source resource_source;
+		} common;
+	};
 };
 
 struct acpi_resource_extended_address64 {
-	ACPI_RESOURCE_ADDRESS_COMMON u8 revision_ID;
-	u64 granularity;
-	u64 minimum;
-	u64 maximum;
-	u64 translation_offset;
-	u64 address_length;
-	u64 type_specific;
+	union {
+		struct {
+			ACPI_RESOURCE_ADDRESS_COMMON
+			u8 revision_ID;
+			ACPI_RESOURCE_ADDRESS64_COMMON
+			u64 type_specific;
+		};
+		struct {
+			struct acpi_resource_address base;
+			u8 revision_ID;
+			struct acpi_resource_address64_common addr;
+			u64 type_specific;
+		} common;
+	};
 };
 
 struct acpi_resource_extended_irq {
-- 
1.7.10.4

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