Module Name: src Committed By: skrll Date: Fri Aug 8 07:34:02 UTC 2014
Modified Files: src/sys/arch/arm/include: mutex.h Log Message: Update a comment. Probably still needs tweaking further. To generate a diff of this commit: cvs rdiff -u -r1.16 -r1.17 src/sys/arch/arm/include/mutex.h Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/arch/arm/include/mutex.h diff -u src/sys/arch/arm/include/mutex.h:1.16 src/sys/arch/arm/include/mutex.h:1.17 --- src/sys/arch/arm/include/mutex.h:1.16 Thu Jun 12 08:50:52 2014 +++ src/sys/arch/arm/include/mutex.h Fri Aug 8 07:34:02 2014 @@ -1,4 +1,4 @@ -/* $NetBSD: mutex.h,v 1.16 2014/06/12 08:50:52 ozaki-r Exp $ */ +/* $NetBSD: mutex.h,v 1.17 2014/08/08 07:34:02 skrll Exp $ */ /*- * Copyright (c) 2002, 2007 The NetBSD Foundation, Inc. @@ -35,15 +35,15 @@ /* * The ARM mutex implementation is troublesome, because pre-v6 ARM lacks a * compare-and-swap operation. However, there aren't any MP pre-v6 ARM - * systems to speak of. We are mostly concerned with atomicity with respect - * to interrupts. + * systems to speak of. * - * ARMv6, however, does have ldrex/strex, and can thus implement an MP-safe - * compare-and-swap. + * ARMv6 and later, however, does have ldrex/strex, and can thus implement an + * MP-safe compare-and-swap. * - * So, what we have done is impement simple mutexes using a compare-and-swap. + * So, what we have done is implement simple mutexes using a compare-and-swap. * We support pre-ARMv6 by implementing CAS as a restartable atomic sequence - * that is checked by the IRQ vector. MP-safe ARMv6 support will be added later. + * that is checked by the IRQ vector. + * */ #ifndef __MUTEX_PRIVATE