Changes in kernel/arch/ppc32/include/cycle.h [df4ed85:7a0359b] in mainline

File:

• kernel/arch/ppc32/include/cycle.h (modified) (1 diff)

kernel/arch/ppc32/include/cycle.h

@@ -36 +36 @@
 #define KERN_ppc32_CYCLE_H_
 
-static inline uint64_t get_cycle(void)
+#include <trace.h>
+
+NO_TRACE static inline uint64_t get_cycle(void)
 {
         uint32_t lower;
         uint32_t upper;
-        uint32_t upper2;
+        uint32_t tmp;
         
-        asm volatile (
-                "1: mftbu %0\n"
-                "mftb %1\n"
-                "mftbu %2\n"
-                "cmpw %0, %2\n"
-                "bne- 1b\n"
-                : "=r" (upper),
-                  "=r" (lower),
-                  "=r" (upper2)
-                :: "cr0"
-        );
+        do {
+                asm volatile (
+                        "mftbu %[upper]\n"
+                        "mftb %[lower]\n"
+                        "mftbu %[tmp]\n"
+                        : [upper] "=r" (upper),
+                          [lower] "=r" (lower),
+                          [tmp] "=r" (tmp)
+                );
+        } while (upper != tmp);
         
         return ((uint64_t) upper << 32) + (uint64_t) lower;