x86: move arch-specific asmlinkage to <asm/linkage.h>

Commit 65dd74a674 (x86: ivybridge: Implement SDRAM init) introduced
x86-specific asmlinkage into arch/x86/include/asm/config.h.

Commit ed0a2fbf14 (x86: Add a definition of asmlinkage) added the
same macro define again, this time, into include/common.h.
(Please do not add arch-specific stuff to include/common.h any more;
it is already too cluttered.)

The generic asmlinkage is defined in <linux/linkage.h>.  If you want
to override it with an arch-specific one, the best way is to add it
to <asm/linkage.h> like Linux Kernel.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/arch-ivybridge/pei_data.h

@@ -7,6 +7,8 @@
 #ifndef ASM_ARCH_PEI_DATA_H
 #define ASM_ARCH_PEI_DATA_H
 
+#include <linux/linkage.h>
+
 struct pch_usb3_controller_settings {
 	/* 0: Disable, 1: Enable, 2: Auto, 3: Smart Auto */
 	uint16_t mode;

arch/x86/include/asm/config.h

@@ -10,6 +10,5 @@
 #define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
-#define asmlinkage __attribute__((regparm(0)))
 
 #endif

arch/x86/include/asm/linkage.h

@@ -0,0 +1,6 @@
+#ifndef _ASM_X86_LINKAGE_H
+#define _ASM_X86_LINKAGE_H
+
+#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
+
+#endif /* _ASM_X86_LINKAGE_H */

arch/x86/lib/bios.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <bios_emul.h>
 #include <vbe.h>
+#include <linux/linkage.h>
 #include <asm/cache.h>
 #include <asm/processor.h>
 #include <asm/i8259.h>

arch/x86/lib/bios.h

@@ -10,6 +10,8 @@
 #ifndef _X86_LIB_BIOS_H
 #define _X86_LIB_BIOS_H
 
+#include <linux/linkage.h>
+
 #define REALMODE_BASE		0x600
 
 #ifdef __ASSEMBLY__

include/common.h

@@ -73,9 +73,6 @@ typedef volatile unsigned char	vu_char;
 #ifdef CONFIG_ARM
 #define asmlinkage	/* nothing */
 #endif
-#ifdef CONFIG_X86
-#define asmlinkage __attribute__((regparm(0)))
-#endif
 #ifdef CONFIG_BLACKFIN
 #include <asm/blackfin.h>
 #endif

include/linux/linkage.h

@@ -17,7 +17,9 @@
 #define CPP_ASMLINKAGE
 #endif
 
+#ifndef asmlinkage
 #define asmlinkage CPP_ASMLINKAGE
+#endif
 
 #define SYMBOL_NAME_STR(X)	#X
 #define SYMBOL_NAME(X)		X