X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=arch_x86.h;h=e7d945e3859393edece5eb4b2aee4c99538083e2;hb=aa8c36e03126a731c6c925cb32a8649c9802198d;hp=cc3ab012c557f38db5df6c7b5c829a13ceaf511a;hpb=0114ba7f23f86623c237baeb28ec8e4b39b9bb84;p=urcu.git

diff --git a/arch_x86.h b/arch_x86.h
index cc3ab01..e7d945e 100644
--- a/arch_x86.h
+++ b/arch_x86.h
@@ -84,10 +84,9 @@
 /* Nop everywhere except on alpha. */
 #define smp_read_barrier_depends()
 
-/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 static inline void rep_nop(void)
 {
-	asm volatile("rep; nop" ::: "memory");
+	asm volatile("rep; nop" : : : "memory");
 }
 
 static inline void cpu_relax(void)
@@ -95,6 +94,14 @@ static inline void cpu_relax(void)
 	rep_nop();
 }
 
+/*
+ * Serialize core instruction execution. Also acts as a compiler barrier.
+ */
+static inline void sync_core(void)
+{
+	asm volatile("cpuid" : : : "memory", "eax", "ebx", "ecx", "edx");
+}
+
 #define rdtscll(val)							  \
 	do {						  		  \
 	     unsigned int __a, __d;					  \