PERFORCE change 58484 for review

[John Baldwin]

http://perforce.freebsd.org/chv.cgi?CH=58484

Change 58484 by jhb at jhb_slimer on 2004/07/29 20:35:13

	Try to optimize intr_disable/restore by avoiding cli/sti like the
	plague.

Affected files ...

.. //depot/projects/smpng/sys/i386/include/cpufunc.h#28 edit

Differences ...

==== //depot/projects/smpng/sys/i386/include/cpufunc.h#28 (text+ko) ====

@@ -611,14 +611,16 @@
 	register_t eflags;
 
 	eflags = read_eflags();
-	disable_intr();
+	if (eflags & PSL_I)
+		disable_intr();
 	return (eflags);
 }
 
 static __inline void
 intr_restore(register_t eflags)
 {
-	write_eflags(eflags);
+	if (eflags & PSL_I)
+		enable_intr();
 }
 
 #else /* !(__GNUC__ || __INTEL_COMPILER) */