1 files changed, 5 insertions, 16 deletions

diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 6266d6b9e0b8..ecda17efa042 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -10,30 +10,19 @@
 #include <linux/irqflags.h>
 #include <linux/jump_label.h>
 
-/*
- * The compiler should not reorder volatile asm statements with respect to each
- * other: they should execute in program order. However GCC 4.9.x and 5.x have
- * a bug (which was fixed in 8.1, 7.3 and 6.5) where they might reorder
- * volatile asm. The write functions are not affected since they have memory
- * clobbers preventing reordering. To prevent reads from being reordered with
- * respect to writes, use a dummy memory operand.
- */
-
-#define __FORCE_ORDER "m"(*(unsigned int *)0x1000UL)
-
 void native_write_cr0(unsigned long val);
 
 static inline unsigned long native_read_cr0(void)
 {
 	unsigned long val;
-	asm volatile("mov %%cr0,%0\n\t" : "=r" (val) : __FORCE_ORDER);
+	asm volatile("mov %%cr0,%0" : "=r" (val));
 	return val;
 }
 
 static __always_inline unsigned long native_read_cr2(void)
 {
 	unsigned long val;
-	asm volatile("mov %%cr2,%0\n\t" : "=r" (val) : __FORCE_ORDER);
+	asm volatile("mov %%cr2,%0" : "=r" (val));
 	return val;
 }
 
@@ -45,7 +34,7 @@ static __always_inline void native_write_cr2(unsigned long val)
 static __always_inline unsigned long __native_read_cr3(void)
 {
 	unsigned long val;
-	asm volatile("mov %%cr3,%0\n\t" : "=r" (val) : __FORCE_ORDER);
+	asm volatile("mov %%cr3,%0" : "=r" (val));
 	return val;
 }
 
@@ -66,10 +55,10 @@ static inline unsigned long native_read_cr4(void)
 	asm volatile("1: mov %%cr4, %0\n"
 		     "2:\n"
 		     _ASM_EXTABLE(1b, 2b)
-		     : "=r" (val) : "0" (0), __FORCE_ORDER);
+		     : "=r" (val) : "0" (0));
 #else
 	/* CR4 always exists on x86_64. */
-	asm volatile("mov %%cr4,%0\n\t" : "=r" (val) : __FORCE_ORDER);
+	asm volatile("mov %%cr4,%0" : "=r" (val));
 #endif
 	return val;
 }