X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=include%2Furcu%2Fuatomic%2Fs390.h;fp=include%2Furcu%2Fuatomic%2Fs390.h;h=d7d545ad8f869ede493edef727233d7e9edc42ad;hp=47b97b1da08159e26abc727679f33c9815768461;hb=713234991cce999c376345400f9367f1e2317076;hpb=835b9ab3ca3777fe42e37e92096226ebd19ca75b

diff --git a/include/urcu/uatomic/s390.h b/include/urcu/uatomic/s390.h
index 47b97b1..d7d545a 100644
--- a/include/urcu/uatomic/s390.h
+++ b/include/urcu/uatomic/s390.h
@@ -62,10 +62,11 @@ extern "C" {
 #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
 
 /*
- * The __hp() macro casts the void pointer "x" to a pointer to a structure
+ * The __hp() macro casts the void pointer @x to a pointer to a structure
  * containing an array of char of the specified size. This allows passing the
  * @addr arguments of the following inline functions as "m" and "+m" operands
- * to the assembly.
+ * to the assembly. The @size parameter should be a constant to support
+ * compilers such as clang which do not support VLA.
  */
 
 #define __hp(size, x)	((struct { char v[size]; } *)(x))
@@ -83,8 +84,8 @@ unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
 		__asm__ __volatile__(
 			"0:	cs %0,%2," MEMOP_REF(%3) "\n"
 			"	brc 4,0b\n"
-			: "=&r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (val), MEMOP_IN (__hp(len, addr))
+			: "=&r" (old_val), MEMOP_OUT (__hp(4, addr))
+			: "r" (val), MEMOP_IN (__hp(4, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -96,8 +97,8 @@ unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
 		__asm__ __volatile__(
 			"0:	csg %0,%2," MEMOP_REF(%3) "\n"
 			"	brc 4,0b\n"
-			: "=&r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (val), MEMOP_IN (__hp(len, addr))
+			: "=&r" (old_val), MEMOP_OUT (__hp(8, addr))
+			: "r" (val), MEMOP_IN (__hp(8, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -127,8 +128,8 @@ unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 			"	cs %0,%2," MEMOP_REF(%3) "\n"
-			: "+r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (_new), MEMOP_IN (__hp(len, addr))
+			: "+r" (old_val), MEMOP_OUT (__hp(4, addr))
+			: "r" (_new), MEMOP_IN (__hp(4, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -137,8 +138,8 @@ unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
 	{
 		__asm__ __volatile__(
 			"	csg %0,%2," MEMOP_REF(%3) "\n"
-			: "+r" (old), MEMOP_OUT (__hp(len, addr))
-			: "r" (_new), MEMOP_IN (__hp(len, addr))
+			: "+r" (old), MEMOP_OUT (__hp(8, addr))
+			: "r" (_new), MEMOP_IN (__hp(8, addr))
 			: "memory", "cc");
 		return old;
 	}