x86/setup: Move internal setup_data structures into setup_data.h

Move struct_efi_setup_data in order to unify duplicated definition of
the data structure in a single place. Also silence clang's warnings
about GNU extensions in real-mode code which might occur from the
changed includes.

[ bp: Massage commit message. ]

Signed-off-by: Thomas Zimmermann <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Reviewed-by: Ard Biesheuvel <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/Makefile

···
 REALMODE_CFLAGS += -Wno-address-of-packed-member
 REALMODE_CFLAGS += $(cc_stack_align4)
 REALMODE_CFLAGS += $(CLANG_FLAGS)
+ifdef CONFIG_CC_IS_CLANG
+REALMODE_CFLAGS += -Wno-gnu
+endif
 export REALMODE_CFLAGS
 
 # BITS is used as extension for files which are available in a 32 bit

arch/x86/boot/compressed/efi.h

···
 	u32 tables;
 } efi_system_table_32_t;
 
-/* kexec external ABI */
-struct efi_setup_data {
-	u64 fw_vendor;
-	u64 __unused;
-	u64 tables;
-	u64 smbios;
-	u64 reserved[8];
-};
-
 struct efi_unaccepted_memory {
 	u32 version;
 	u32 unit_size;

arch/x86/include/asm/efi.h

···
 void arch_efi_call_virt_setup(void);
 void arch_efi_call_virt_teardown(void);
 
-/* kexec external ABI */
-struct efi_setup_data {
-	u64 fw_vendor;
-	u64 __unused;
-	u64 tables;
-	u64 smbios;
-	u64 reserved[8];
-};
-
 extern u64 efi_setup;
 
 #ifdef CONFIG_EFI

arch/x86/include/asm/pci.h

···
 #include <linux/numa.h>
 #include <asm/io.h>
 #include <asm/memtype.h>
-#include <asm/setup_data.h>
 
 struct pci_sysdata {
 	int		domain;		/* PCI domain */
···
 			      cpumask_of_node(node);
 }
 #endif
-
-struct pci_setup_rom {
-	struct setup_data data;
-	uint16_t vendor;
-	uint16_t devid;
-	uint64_t pcilen;
-	unsigned long segment;
-	unsigned long bus;
-	unsigned long device;
-	unsigned long function;
-	uint8_t romdata[];
-};
 
 #endif /* _ASM_X86_PCI_H */

arch/x86/include/asm/setup_data.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_SETUP_DATA_H
+#define _ASM_X86_SETUP_DATA_H
+
+#include <uapi/asm/setup_data.h>
+
+#ifndef __ASSEMBLY__
+
+struct pci_setup_rom {
+	struct setup_data data;
+	uint16_t vendor;
+	uint16_t devid;
+	uint64_t pcilen;
+	unsigned long segment;
+	unsigned long bus;
+	unsigned long device;
+	unsigned long function;
+	uint8_t romdata[];
+};
+
+/* kexec external ABI */
+struct efi_setup_data {
+	u64 fw_vendor;
+	u64 __unused;
+	u64 tables;
+	u64 smbios;
+	u64 reserved[8];
+};
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_X86_SETUP_DATA_H */