Eric Lee / smarc-fsl-linux-kernel

31 Mar, 2011

1 commit

01 Feb, 2011

1 commit

  • e2830b5c1   time: Make do_timer() and xtime_lock local to kernel/time/ ... Browse Code »

    All callers of do_timer() are converted to xtime_update(). The only
    users of xtime_lock are in kernel/time/. Make both local to
    kernel/time/ and remove them from the global header files.

    [ tglx: Reuse tick-internal.h instead of creating another local header
    file. Massaged changelog ]

    Signed-off-by: Torben Hohn
    Cc: Peter Zijlstra
    Cc: johnstul@us.ibm.com
    Cc: yong.zhang0@gmail.com
    Cc: hch@infradead.org
    Signed-off-by: Thomas Gleixner

    Torben Hohn
     

31 Jan, 2011

1 commit

15 Aug, 2009

1 commit

  • f1b82746c   clocksource: Cleanup clocksource selection ... Browse Code »

    If a non high-resolution clocksource is first set as override clock
    and then registered it becomes active even if the system is in one-shot
    mode. Move the override check from sysfs_override_clocksource to the
    clocksource selection. That fixes the bug and simplifies the code. The
    check in clocksource_register for double registration of the same
    clocksource is removed without replacement.

    To find the initial clocksource a new weak function in jiffies.c is
    defined that returns the jiffies clocksource. The architecture code
    can then override the weak function with a more suitable clocksource,
    e.g. the TOD clock on s390.

    [ tglx: Folded in a fix from John Stultz ]

    Signed-off-by: Martin Schwidefsky
    Acked-by: John Stultz
    Cc: Daniel Walker
    LKML-Reference:
    Signed-off-by: Thomas Gleixner

    Martin Schwidefsky
     

22 Apr, 2009

1 commit

  • 8e19608e8   clocksource: pass clocksource to read() callback ... Browse Code »

    Pass clocksource pointer to the read() callback for clocksources. This
    allows us to share the callback between multiple instances.

    [hugh@veritas.com: fix powerpc build of clocksource pass clocksource mods]
    [akpm@linux-foundation.org: cleanup]
    Signed-off-by: Magnus Damm
    Acked-by: John Stultz
    Cc: Thomas Gleixner
    Signed-off-by: Hugh Dickins
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Magnus Damm
     

06 Jan, 2009

1 commit

21 Aug, 2008

1 commit

  • 1aa5dfb75   clocksource: keep track of original clocksource frequency ... Browse Code »

    The clocksource frequency is represented by
    clocksource->mult/2^(clocksource->shift). Currently, when NTP makes
    adjustments to the clock frequency, they are made directly to the mult
    value.

    This has the drawback that once changed, we cannot know what the orignal
    mult value was, or how much adjustment has been applied.

    This property causes problems in calculating proper ntp intervals when
    switching back and forth between clocksources.

    This patch separates the current mult value into a mult and mult_orig
    pair. The mult_orig value stays constant, while the ntp clocksource
    adjustments are done only to the mult value.

    This allows for correct ntp interval calculation and additionally lays the
    groundwork for a new notion of time, what I'm calling the monotonic-raw
    time, which is introduced in a following patch.

    Signed-off-by: John Stultz
    Signed-off-by: Roman Zippel
    Signed-off-by: Andrew Morton
    Signed-off-by: Ingo Molnar

    John Stultz
     

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