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--- msr-tools-1.1.2/wrmsr.c.orig 2004-07-20 09:54:59.000000000 -0600
+++ msr-tools-1.1.2/wrmsr.c 2011-12-27 14:07:24.505887313 -0700
@@ -90,7 +90,11 @@ int main(int argc, char *argv[])
reg = strtoul(argv[optind++], NULL, 0);
+#ifdef SMP
sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+#else
+ sprintf(msr_file_name, "/dev/msr%d", cpu);
+#endif
fd = open(msr_file_name, O_WRONLY);
if ( fd < 0 ) {
if ( errno == ENXIO ) {
--- msr-tools-1.1.2/rdmsr.c.orig 2004-07-20 09:54:59.000000000 -0600
+++ msr-tools-1.1.2/rdmsr.c 2011-12-27 14:06:37.831584784 -0700
@@ -167,7 +167,11 @@ int main(int argc, char *argv[])
reg = strtoul(argv[optind], NULL, 0);
+#ifdef SMP
sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+#else
+ sprintf(msr_file_name, "/dev/msr%d", cpu);
+#endif
fd = open(msr_file_name, O_RDONLY);
if ( fd < 0 ) {
if ( errno == ENXIO ) {
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