[PATCH] x86_64: x86_64 version of the smp alternative patch.

Changes are largely identical to the i386 version:

 * alternative #define are moved to the new alternative.h file.
 * one new elf section with pointers to the lock prefixes which can be
   nop'ed out for non-smp.
 * two new elf sections simliar to the "classic" alternatives to
   replace SMP code with simpler UP code.
 * fixup headers to use alternative.h instead of defining their own
   LOCK / LOCK_PREFIX macros.

The patch reuses the i386 version of the alternatives code to avoid code
duplication.  The code in alternatives.c was shuffled around a bit to
reduce the number of #ifdefs needed.  It also got some tweaks needed for
x86_64 (vsyscall page handling) and new features (noreplacement option
which was x86_64 only up to now).  Debug printk's are changed from
compile-time to runtime.

Loosely based on a early version from Bastian Blank <waldi@debian.org>

Signed-off-by: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 21 deletions

diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index bd3fa67ed83..007e88d6d43 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -1,7 +1,7 @@
 #ifndef __ARCH_X86_64_ATOMIC__
 #define __ARCH_X86_64_ATOMIC__
 
-#include <asm/types.h>
+#include <asm/alternative.h>
 
 /* atomic_t should be 32 bit signed type */
 
@@ -52,7 +52,7 @@ typedef struct { volatile int counter; } atomic_t;
 static __inline__ void atomic_add(int i, atomic_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "addl %1,%0"
+		LOCK_PREFIX "addl %1,%0"
 		:"=m" (v->counter)
 		:"ir" (i), "m" (v->counter));
 }
@@ -67,7 +67,7 @@ static __inline__ void atomic_add(int i, atomic_t *v)
 static __inline__ void atomic_sub(int i, atomic_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "subl %1,%0"
+		LOCK_PREFIX "subl %1,%0"
 		:"=m" (v->counter)
 		:"ir" (i), "m" (v->counter));
 }
@@ -86,7 +86,7 @@ static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "subl %2,%0; sete %1"
+		LOCK_PREFIX "subl %2,%0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"ir" (i), "m" (v->counter) : "memory");
 	return c;
@@ -101,7 +101,7 @@ static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
 static __inline__ void atomic_inc(atomic_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "incl %0"
+		LOCK_PREFIX "incl %0"
 		:"=m" (v->counter)
 		:"m" (v->counter));
 }
@@ -115,7 +115,7 @@ static __inline__ void atomic_inc(atomic_t *v)
 static __inline__ void atomic_dec(atomic_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "decl %0"
+		LOCK_PREFIX "decl %0"
 		:"=m" (v->counter)
 		:"m" (v->counter));
 }
@@ -133,7 +133,7 @@ static __inline__ int atomic_dec_and_test(atomic_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "decl %0; sete %1"
+		LOCK_PREFIX "decl %0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"m" (v->counter) : "memory");
 	return c != 0;
@@ -152,7 +152,7 @@ static __inline__ int atomic_inc_and_test(atomic_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "incl %0; sete %1"
+		LOCK_PREFIX "incl %0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"m" (v->counter) : "memory");
 	return c != 0;
@@ -172,7 +172,7 @@ static __inline__ int atomic_add_negative(int i, atomic_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "addl %2,%0; sets %1"
+		LOCK_PREFIX "addl %2,%0; sets %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"ir" (i), "m" (v->counter) : "memory");
 	return c;
@@ -189,7 +189,7 @@ static __inline__ int atomic_add_return(int i, atomic_t *v)
 {
 	int __i = i;
 	__asm__ __volatile__(
-		LOCK "xaddl %0, %1;"
+		LOCK_PREFIX "xaddl %0, %1;"
 		:"=r"(i)
 		:"m"(v->counter), "0"(i));
 	return i + __i;
@@ -237,7 +237,7 @@ typedef struct { volatile long counter; } atomic64_t;
 static __inline__ void atomic64_add(long i, atomic64_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "addq %1,%0"
+		LOCK_PREFIX "addq %1,%0"
 		:"=m" (v->counter)
 		:"ir" (i), "m" (v->counter));
 }
@@ -252,7 +252,7 @@ static __inline__ void atomic64_add(long i, atomic64_t *v)
 static __inline__ void atomic64_sub(long i, atomic64_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "subq %1,%0"
+		LOCK_PREFIX "subq %1,%0"
 		:"=m" (v->counter)
 		:"ir" (i), "m" (v->counter));
 }
@@ -271,7 +271,7 @@ static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "subq %2,%0; sete %1"
+		LOCK_PREFIX "subq %2,%0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"ir" (i), "m" (v->counter) : "memory");
 	return c;
@@ -286,7 +286,7 @@ static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v)
 static __inline__ void atomic64_inc(atomic64_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "incq %0"
+		LOCK_PREFIX "incq %0"
 		:"=m" (v->counter)
 		:"m" (v->counter));
 }
@@ -300,7 +300,7 @@ static __inline__ void atomic64_inc(atomic64_t *v)
 static __inline__ void atomic64_dec(atomic64_t *v)
 {
 	__asm__ __volatile__(
-		LOCK "decq %0"
+		LOCK_PREFIX "decq %0"
 		:"=m" (v->counter)
 		:"m" (v->counter));
 }
@@ -318,7 +318,7 @@ static __inline__ int atomic64_dec_and_test(atomic64_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "decq %0; sete %1"
+		LOCK_PREFIX "decq %0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"m" (v->counter) : "memory");
 	return c != 0;
@@ -337,7 +337,7 @@ static __inline__ int atomic64_inc_and_test(atomic64_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "incq %0; sete %1"
+		LOCK_PREFIX "incq %0; sete %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"m" (v->counter) : "memory");
 	return c != 0;
@@ -357,7 +357,7 @@ static __inline__ int atomic64_add_negative(long i, atomic64_t *v)
 	unsigned char c;
 
 	__asm__ __volatile__(
-		LOCK "addq %2,%0; sets %1"
+		LOCK_PREFIX "addq %2,%0; sets %1"
 		:"=m" (v->counter), "=qm" (c)
 		:"ir" (i), "m" (v->counter) : "memory");
 	return c;
@@ -374,7 +374,7 @@ static __inline__ long atomic64_add_return(long i, atomic64_t *v)
 {
 	long __i = i;
 	__asm__ __volatile__(
-		LOCK "xaddq %0, %1;"
+		LOCK_PREFIX "xaddq %0, %1;"
 		:"=r"(i)
 		:"m"(v->counter), "0"(i));
 	return i + __i;
@@ -418,11 +418,11 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
 
 /* These are x86-specific, used by some header files */
 #define atomic_clear_mask(mask, addr) \
-__asm__ __volatile__(LOCK "andl %0,%1" \
+__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
 : : "r" (~(mask)),"m" (*addr) : "memory")
 
 #define atomic_set_mask(mask, addr) \
-__asm__ __volatile__(LOCK "orl %0,%1" \
+__asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
 : : "r" ((unsigned)mask),"m" (*(addr)) : "memory")
 
 /* Atomic operations are already serializing on x86 */