Index: kernel/arch/ia32/include/asm.h
===================================================================
--- kernel/arch/ia32/include/asm.h	(revision a71c158ef82122abfeef92f86344709bbad55d17)
+++ kernel/arch/ia32/include/asm.h	(revision ff211d250373e7bc4e7c6a89838a8a7a4dea9e8f)
@@ -392,5 +392,5 @@
 	asm volatile (
 		"sgdtl %[gdtr_reg]\n"
-		:: [gdtr_reg] "m" (*gdtr_reg)
+		: [gdtr_reg] "=m" (*gdtr_reg)
 	);
 }