x86/tsc: Read all ratio bits from MSR_PLATFORM_INFO

[deliverable/linux.git] / arch / x86 / kernel / tsc_msr.c

diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 92ae6acac8a7fbcb9b91cb386b3c23015c5377ea..6aa0f4d9eea6816bbf0c78514e0b76d8f4dc7def 100644 (file)
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -92,7 +92,7 @@ unsigned long try_msr_calibrate_tsc(void)
 
        if (freq_desc_tables[cpu_index].msr_plat) {
                rdmsr(MSR_PLATFORM_INFO, lo, hi);
-               ratio = (lo >> 8) & 0x1f;
+               ratio = (lo >> 8) & 0xff;
        } else {
                rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
                ratio = (hi >> 8) & 0x1f;