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    Subject[PATCH] [3/45] x86: Separate checking of unsynchronized and unstable TSC
    Date

    Preparationary patch for the new sched/printk_clock()

    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    arch/i386/kernel/tsc.c | 9 ++++-----
    arch/x86_64/kernel/tsc.c | 5 +----
    2 files changed, 5 insertions(+), 9 deletions(-)

    Index: linux/arch/i386/kernel/tsc.c
    ===================================================================
    --- linux.orig/arch/i386/kernel/tsc.c
    +++ linux/arch/i386/kernel/tsc.c
    @@ -332,7 +332,7 @@ static struct dmi_system_id __initdata b
    */
    __cpuinit int unsynchronized_tsc(void)
    {
    - if (!cpu_has_tsc || tsc_unstable)
    + if (!cpu_has_tsc)
    return 1;
    /*
    * Intel systems are normally all synchronized.
    @@ -341,9 +341,9 @@ __cpuinit int unsynchronized_tsc(void)
    if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) {
    /* assume multi socket systems are not synchronized: */
    if (num_possible_cpus() > 1)
    - tsc_unstable = 1;
    + return 1;
    }
    - return tsc_unstable;
    + return 0;
    }

    /*
    @@ -387,13 +387,12 @@ void __init tsc_init(void)
    /* Check and install the TSC clocksource */
    dmi_check_system(bad_tsc_dmi_table);

    - unsynchronized_tsc();
    check_geode_tsc_reliable();
    current_tsc_khz = tsc_khz;
    clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
    clocksource_tsc.shift);
    /* lower the rating if we already know its unstable: */
    - if (check_tsc_unstable()) {
    + if (check_tsc_unstable() || unsynchronized_tsc()) {
    clocksource_tsc.rating = 0;
    clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
    } else
    Index: linux/arch/x86_64/kernel/tsc.c
    ===================================================================
    --- linux.orig/arch/x86_64/kernel/tsc.c
    +++ linux/arch/x86_64/kernel/tsc.c
    @@ -124,9 +124,6 @@ core_initcall(cpufreq_tsc);
    */
    __cpuinit int unsynchronized_tsc(void)
    {
    - if (tsc_unstable)
    - return 1;
    -
    #ifdef CONFIG_SMP
    if (apic_is_clustered_box())
    return 1;
    @@ -199,7 +196,7 @@ void __init init_tsc_clocksource(void)
    if (!notsc) {
    clocksource_tsc.mult = clocksource_khz2mult(tsc_khz,
    clocksource_tsc.shift);
    - if (check_tsc_unstable())
    + if (unsynchronized_tsc() || check_tsc_unstable())
    clocksource_tsc.rating = 0;

    clocksource_register(&clocksource_tsc);
    -
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