[patch 1/2] x86: cleanup alternative.h

[Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>]

[-- Attachment #1: x86-cleanup-alternative.h.patch --]
[-- Type: text/plain, Size: 4853 bytes --]

Alternative header duplicates assembly that could be merged in one single macro.
Merging this into this macro also allows to directly declare ALTERNATIVE()
statements within assembly code.

Uses a __stringify() of the feature bits rather than passing a "i" operand.
Leave the old %0 operand as-is (set to 0), unused to stay compatible with API.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: 'Ingo Molnar' <mingo@elte.hu>
CC: H. Peter Anvin <hpa@zytor.com>
CC: Andi Kleen <andi@firstfloor.org>
CC: Andrew Morton <akpm@linux-foundation.org>
---
 arch/x86/include/asm/alternative.h |   58 ++++++++++++++-----------------------
 1 file changed, 22 insertions(+), 36 deletions(-)

Index: linux-2.6-lttng/arch/x86/include/asm/alternative.h
===================================================================
--- linux-2.6-lttng.orig/arch/x86/include/asm/alternative.h	2009-04-22 16:14:23.000000000 -0400
+++ linux-2.6-lttng/arch/x86/include/asm/alternative.h	2009-04-22 16:17:48.000000000 -0400
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <linux/stddef.h>
+#include <linux/stringify.h>
 #include <asm/asm.h>
 
 /*
@@ -74,6 +75,21 @@ static inline void alternatives_smp_swit
 
 const unsigned char *const *find_nop_table(void);
 
+/* alternative assembly primitive */
+#define ALTERNATIVE(oldinstr, newinstr, feature) \
+	      "661:\n\t" oldinstr "\n662:\n"			\
+	      ".section .altinstructions,\"a\"\n"		\
+	      _ASM_ALIGN "\n"					\
+	      _ASM_PTR "661b\n"		/* label */		\
+	      _ASM_PTR "663f\n"		/* new instruction */	\
+	      "	 .byte " __stringify(feature) "\n"	/* feature bit */ \
+	      "	 .byte 662b-661b\n"	/* sourcelen */		\
+	      "	 .byte 664f-663f\n"	/* replacementlen */	\
+	      ".previous\n"					\
+	      ".section .altinstr_replacement,\"ax\"\n"		\
+	      "663:\n\t" newinstr "\n664:\n"  /* replacement */	\
+	      ".previous"
+
 /*
  * Alternative instructions for different CPU types or capabilities.
  *
@@ -87,18 +103,7 @@ const unsigned char *const *find_nop_tab
  * without volatile and memory clobber.
  */
 #define alternative(oldinstr, newinstr, feature)			\
-	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\
-		      ".section .altinstructions,\"a\"\n"		\
-		      _ASM_ALIGN "\n"					\
-		      _ASM_PTR "661b\n"		/* label */		\
-		      _ASM_PTR "663f\n"		/* new instruction */	\
-		      "	 .byte %c0\n"		/* feature bit */	\
-		      "	 .byte 662b-661b\n"	/* sourcelen */		\
-		      "	 .byte 664f-663f\n"	/* replacementlen */	\
-		      ".previous\n"					\
-		      ".section .altinstr_replacement,\"ax\"\n"		\
-		      "663:\n\t" newinstr "\n664:\n"  /* replacement */	\
-		      ".previous" :: "i" (feature) : "memory")
+	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) : : : "memory")
 
 /*
  * Alternative inline assembly with input.
@@ -109,35 +114,16 @@ const unsigned char *const *find_nop_tab
  * Best is to use constraints that are fixed size (like (%1) ... "r")
  * If you use variable sized constraints like "m" or "g" in the
  * replacement make sure to pad to the worst case length.
+ * Leaving an unused argument 0 to keep API compatibility.
  */
 #define alternative_input(oldinstr, newinstr, feature, input...)	\
-	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\
-		      ".section .altinstructions,\"a\"\n"		\
-		      _ASM_ALIGN "\n"					\
-		      _ASM_PTR "661b\n"		/* label */		\
-		      _ASM_PTR "663f\n"		/* new instruction */	\
-		      "	 .byte %c0\n"		/* feature bit */	\
-		      "	 .byte 662b-661b\n"	/* sourcelen */		\
-		      "	 .byte 664f-663f\n"	/* replacementlen */	\
-		      ".previous\n"					\
-		      ".section .altinstr_replacement,\"ax\"\n"		\
-		      "663:\n\t" newinstr "\n664:\n"  /* replacement */	\
-		      ".previous" :: "i" (feature), ##input)
+	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature)		\
+		: : "i" (0), ## input)
 
 /* Like alternative_input, but with a single output argument */
 #define alternative_io(oldinstr, newinstr, feature, output, input...)	\
-	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\
-		      ".section .altinstructions,\"a\"\n"		\
-		      _ASM_ALIGN "\n"					\
-		      _ASM_PTR "661b\n"		/* label */		\
-		      _ASM_PTR "663f\n"		/* new instruction */	\
-		      "	 .byte %c[feat]\n"	/* feature bit */	\
-		      "	 .byte 662b-661b\n"	/* sourcelen */		\
-		      "	 .byte 664f-663f\n"	/* replacementlen */	\
-		      ".previous\n"					\
-		      ".section .altinstr_replacement,\"ax\"\n"		\
-		      "663:\n\t" newinstr "\n664:\n"  /* replacement */ \
-		      ".previous" : output : [feat] "i" (feature), ##input)
+	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature)		\
+		: output : "i" (0), ## input)
 
 /*
  * use this macro(s) if you need more than one output parameter

-- 
Mathieu Desnoyers
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