Eric Lee / smarc-ti-linux-kernel

05 Apr, 2007

1 commit

  • 98de9e3ba   [PATCH] fix jiffies clocksource inittime ... Browse Code »

    In debugging a problem w/ the -rt tree, I noticed that on systems that mark
    the tsc as unstable before it is registered, the TSC would still be
    selected and used for a short period of time. Digging in it looks to be a
    result of the mix of the clocksource list changes and my clocksource
    initialization changes.

    With the -rt tree, using a bad TSC, even for a short period of time can
    results in a hang at boot. I was not able to reproduce this hang w/
    mainline, but I'm not completely certain that someone won't trip on it.

    This patch resolves the issue by initializing the jiffies clocksource
    earlier so a bad TSC won't get selected just because nothing else is yet
    registered.

    Signed-off-by: John Stultz
    Acked-by: Thomas Gleixner
    Cc: Ingo Molnar
    Cc: Andi Kleen
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    john stultz
     

17 Feb, 2007

1 commit

  • 73b08d2aa   [PATCH] clocksource: replace is_continuous by a flag field ... Browse Code »

    Using a flag filed allows to encode more than one information into a variable.
    Preparatory patch for the generic clocksource verification.

    [mingo@elte.hu: convert vmitime.c to the new clocksource flag]
    Signed-off-by: Thomas Gleixner
    Signed-off-by: Ingo Molnar
    Cc: john stultz
    Cc: Roman Zippel
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     

17 Oct, 2006

1 commit

  • 3f4a0b917   [PATCH] i386 Time: Avoid PIT SMP lockups ... Browse Code »

    Avoid possible PIT livelock issues seen on SMP systems (and reported by
    Andi), by not allowing it as a clocksource on SMP boxes.

    However, since the PIT may no longer be present, we have to properly handle
    the cases where SMP systems have TSC skew and fall back from the TSC.
    Since the PIT isn't there, it would "fall back" to the TSC again. So this
    changes the jiffies rating to 1, and the TSC-bad rating value to 0.

    Thus you will get the following behavior priority on i386 systems:

    tsc [if present & stable]
    hpet [if present]
    cyclone [if present]
    acpi_pm [if present]
    pit [if UP]
    jiffies

    Rather then the current more complicated:
    tsc [if present & stable]
    hpet [if present]
    cyclone [if present]
    acpi_pm [if present]
    pit [if cpus < 4]
    tsc [if present & unstable]
    jiffies

    Signed-off-by: John Stultz
    Cc: Andi Kleen
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    john stultz
     

27 Jun, 2006

2 commits

  • a27525497   [PATCH] time: rename clocksource functions ... Browse Code »

    As suggested by Roman Zippel, change clocksource functions to use
    clocksource_xyz rather then xyz_clocksource to avoid polluting the
    namespace.

    Signed-off-by: John Stultz
    Cc: Roman Zippel
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    john stultz
     
  • 734efb467   [PATCH] Time: Clocksource Infrastructure ... Browse Code »

    This introduces the clocksource management infrastructure. A clocksource is a
    driver-like architecture generic abstraction of a free-running counter. This
    code defines the clocksource structure, and provides management code for
    registering, selecting, accessing and scaling clocksources.

    Additionally, this includes the trivial jiffies clocksource, a lowest common
    denominator clocksource, provided mainly for use as an example.

    [hirofumi@mail.parknet.co.jp: Don't enable IRQ too early]
    Signed-off-by: John Stultz
    Signed-off-by: Ingo Molnar
    Signed-off-by: Paul Mundt
    Signed-off-by: John Stultz
    Signed-off-by: OGAWA Hirofumi
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    john stultz