ck_pr: Adopt const qualifer for load/store.

We will adopt these semantics for the rest of _ptr
family at some point in the future as well.

include/gcc/ppc/ck_pr.h

@@ -96,7 +96,7 @@ ck_pr_barrier(void)
 
 #define CK_PR_LOAD(S, M, T, C, I)				\
 	CK_CC_INLINE static T					\
-	ck_pr_load_##S(M *target)				\
+	ck_pr_load_##S(const M *target)				\
 	{							\
 		T r;						\
 		__asm__ __volatile__(I "%U1%X1 %0, %1"		\
@@ -132,7 +132,7 @@ CK_PR_LOAD_S(char, char, "lbz")
 		return;						\
 	}
 
-CK_PR_STORE(ptr, void, void *, uint32_t, "stw")
+CK_PR_STORE(ptr, void, const void *, uint32_t, "stw")
 
 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
 

include/gcc/ppc64/ck_pr.h

@@ -99,7 +99,7 @@ ck_pr_barrier(void)
 
 #define CK_PR_LOAD(S, M, T, C, I)				\
 	CK_CC_INLINE static T					\
-	ck_pr_load_##S(M *target)				\
+	ck_pr_load_##S(const M *target)				\
 	{							\
 		T r;						\
 		__asm__ __volatile__(I "%U1%X1 %0, %1"		\
@@ -137,7 +137,7 @@ CK_PR_LOAD_S(double, double, "ld")
 		return;						\
 	}
 
-CK_PR_STORE(ptr, void, void *, uint64_t, "std")
+CK_PR_STORE(ptr, void, const void *, uint64_t, "std")
 
 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
 

include/gcc/sparcv9/ck_pr.h

@@ -98,7 +98,7 @@ ck_pr_barrier(void)
 
 #define CK_PR_LOAD(S, M, T, C, I)				\
 	CK_CC_INLINE static T					\
-	ck_pr_load_##S(M *target)				\
+	ck_pr_load_##S(const M *target)				\
 	{							\
 		T r;						\
 		__asm__ __volatile__(I " [%1], %0"		\
@@ -133,7 +133,7 @@ CK_PR_LOAD_S(int, int, "ldsw")
 		return;						\
 	}
 
-CK_PR_STORE(ptr, void, void *, uint64_t, "stx")
+CK_PR_STORE(ptr, void, const void *, uint64_t, "stx")
 
 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
 

include/gcc/x86/ck_pr.h

@@ -140,7 +140,7 @@ CK_PR_FAS_S(8,  uint8_t,  "xchgb")
 
 #define CK_PR_LOAD(S, M, T, C, I)				\
 	CK_CC_INLINE static T					\
-	ck_pr_load_##S(M *target)				\
+	ck_pr_load_##S(const M *target)				\
 	{							\
 		T r;						\
 		__asm__ __volatile__(I " %1, %0"		\
@@ -175,7 +175,7 @@ CK_PR_LOAD_S(8,  uint8_t,  "movb")
 		return;						\
 	}
 
-CK_PR_STORE(ptr, void, void *, char, "movl")
+CK_PR_STORE(ptr, void, const void *, char, "movl")
 
 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
 

include/gcc/x86_64/ck_pr.h

@@ -144,7 +144,7 @@ CK_PR_FAS_S(8,  uint8_t,  "xchgb")
  */
 #define CK_PR_LOAD(S, M, T, C, I)				\
 	CK_CC_INLINE static T					\
-	ck_pr_load_##S(M *target)				\
+	ck_pr_load_##S(const M *target)				\
 	{							\
 		T r;						\
 		__asm__ __volatile__(I " %1, %0"		\
@@ -171,15 +171,14 @@ CK_PR_LOAD_S(8,  uint8_t,  "movb")
 #undef CK_PR_LOAD
 
 CK_CC_INLINE static void
-ck_pr_load_64_2(uint64_t target[2], uint64_t v[2])
+ck_pr_load_64_2(const uint64_t target[2], uint64_t v[2])
 {
 	__asm__ __volatile__("movq %%rdx, %%rcx;"
 			     "movq %%rax, %%rbx;"
 			     CK_PR_LOCK_PREFIX "cmpxchg16b %0;"
-				: "+m" (*(uint64_t *)target),
-				  "=a" (v[0]),
+				: "=a" (v[0]),
 				  "=d" (v[1])
-				:
+				: "m" (*(const uint64_t *)target)
 				: "rbx", "rcx", "memory", "cc");
 	return;
 }
@@ -193,9 +192,10 @@ ck_pr_load_ptr_2(void *t, void *v)
 
 #define CK_PR_LOAD_2(S, W, T)							\
 	CK_CC_INLINE static void						\
-	ck_pr_load_##S##_##W(T t[2], T v[2])					\
+	ck_pr_load_##S##_##W(const T t[2], T v[2])				\
 	{									\
-		ck_pr_load_64_2((uint64_t *)(void *)t, (uint64_t *)(void *)v);	\
+		ck_pr_load_64_2((const uint64_t *)(const void *)t,		\
+				(uint64_t *)(void *)v);				\
 		return;								\
 	}
 
@@ -222,7 +222,7 @@ CK_PR_LOAD_2(8, 16, uint8_t)
 		return;						\
 	}
 
-CK_PR_STORE(ptr, void, void *, char, "movq")
+CK_PR_STORE(ptr, void, const void *, char, "movq")
 
 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)