x86: linkage.h - guard assembler specifics by __ASSEMBLY__

Stephen Rothwell reported:

|Today's linux-next build (x86_64 allmodconfig) produced this warning:
|
|In file included from drivers/char/epca.c:49:
|drivers/char/digiFep1.h:7:1: warning: "GLOBAL" redefined
|In file included from include/linux/linkage.h:5,
|                 from include/linux/kernel.h:11,
|                 from arch/x86/include/asm/system.h:10,
|                 from arch/x86/include/asm/processor.h:17,
|                 from include/linux/prefetch.h:14,
|                 from include/linux/list.h:6,
|                 from include/linux/module.h:9,
|                 from drivers/char/epca.c:29:
|arch/x86/include/asm/linkage.h:55:1: warning: this is the location of the previous definition
|
|Probably introduced by commit 95695547
|("x86: asm linkage - introduce GLOBAL macro") from the x86 tree.

Any assembler specific snippets being placed in headers
are to be protected by __ASSEMBLY__. Fixed.

Also move __ALIGN definition under the same protection as well.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org>
LKML-Reference: <20090306160833.GB7420@localhost>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/include/asm/linkage.h

@@ -4,11 +4,6 @@
 #undef notrace
 #define notrace __attribute__((no_instrument_function))
 
-#ifdef CONFIG_X86_64
-#define __ALIGN .p2align 4,,15
-#define __ALIGN_STR ".p2align 4,,15"
-#endif
-
 #ifdef CONFIG_X86_32
 #define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
 /*
@@ -50,16 +45,25 @@
 	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
 			      "g" (arg4), "g" (arg5), "g" (arg6))
 
-#endif
+#endif /* CONFIG_X86_32 */
+
+#ifdef __ASSEMBLY__
 
 #define GLOBAL(name)	\
 	.globl name;	\
 	name:
 
+#ifdef CONFIG_X86_64
+#define __ALIGN .p2align 4,,15
+#define __ALIGN_STR ".p2align 4,,15"
+#endif
+
 #ifdef CONFIG_X86_ALIGNMENT_16
 #define __ALIGN .align 16,0x90
 #define __ALIGN_STR ".align 16,0x90"
 #endif
 
+#endif /* __ASSEMBLY__ */
+
 #endif /* _ASM_X86_LINKAGE_H */