diff --git a/sys/arm/include/profile.h b/sys/arm/include/profile.h
index a4973175f3bd..6fcbbdc2b83a 100644
--- a/sys/arm/include/profile.h
+++ b/sys/arm/include/profile.h
@@ -114,12 +114,6 @@ void user(void);
 
 #include <machine/asm.h>
 #include <machine/cpufunc.h>
-/*
- * splhigh() and splx() are heavyweight, and call mcount().  Therefore
- * we disabled interrupts (IRQ, but not FIQ) directly on the CPU.
- *
- * We're lucky that the CPSR and 's' both happen to be 'int's.
- */
 #define	MCOUNT_ENTER(s)	{s = intr_disable(); }	/* kill IRQ */
 #define	MCOUNT_EXIT(s)	{intr_restore(s); }	/* restore old value */
 
diff --git a/sys/mips/include/profile.h b/sys/mips/include/profile.h
index 3f04e298c7c5..5968deb60b43 100644
--- a/sys/mips/include/profile.h
+++ b/sys/mips/include/profile.h
@@ -76,13 +76,6 @@
 	".set at");
 
 #ifdef _KERNEL
-/*
- * The following two macros do splhigh and splx respectively.
- * They have to be defined this way because these are real
- * functions on the MIPS, and we do not want to invoke mcount
- * recursively.
- */
-
 #define	MCOUNT_DECL(s)	u_long s;
 #ifdef SMP
 extern int	mcount_lock;