Date: Thu, 29 Jul 2004 20:35:52 GMT From: John Baldwin <jhb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 58484 for review Message-ID: <200407292035.i6TKZqh2054795@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=58484 Change 58484 by jhb@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) */
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