Eric Lee / smarc-fsl-linux-kernel

23 Mar, 2011

2 commits

22 Oct, 2010

1 commit

30 Sep, 2010

1 commit

18 Sep, 2010

1 commit

27 Jul, 2010

1 commit

  • 592913ecb   time: Kill off CONFIG_GENERIC_TIME ... Browse Code »

    Now that all arches have been converted over to use generic time via
    clocksources or arch_gettimeoffset(), we can remove the GENERIC_TIME
    config option and simplify the generic code.

    Signed-off-by: John Stultz
    LKML-Reference:
    Signed-off-by: Thomas Gleixner

    John Stultz
     

04 Jun, 2010

1 commit

29 May, 2010

2 commits

  • e4f2e5eaa   Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 ... Browse Code »

    * 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
    intel_idle: native hardware cpuidle driver for latest Intel processors
    ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case
    acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING
    sched: clarify commment for TS_POLLING
    ACPI: allow a native cpuidle driver to displace ACPI
    cpuidle: make cpuidle_curr_driver static
    cpuidle: add cpuidle_unregister_driver() error check
    cpuidle: fail to register if !CONFIG_CPU_IDLE

    Linus Torvalds
     
  • 0dc698b93   ACPI: Don't let acpi_pad needlessly mark TSC unstable ... Browse Code »

    acpi pad driver kind of aggressively marks TSC as unstable at init
    time, on mwait capable and non X86_FEATURE_NONSTOP_TSC systems. This is
    irrespective of whether pad driver is ever going to be used on the
    system or deep C-states are supported/used. This will affect every user
    who just happens to compile in (or get a kernel version which
    compiles in) acpi pad driver.

    Move mark_tsc_unstable() out of init to the actual idle invocation path
    of the pad driver.

    There is also another bug/missing_feature in the code that it does not
    support 'always running apic timer' and switches to broadcast mode
    unconditionally. Shaohua, can you take a look at that please.

    Signed-off-by: Venkatesh Pallipadi
    Signed-off-by: Len Brown

    Venkatesh Pallipadi
     

28 May, 2010

1 commit

06 May, 2010

1 commit

  • a40770a95   acpi_pad: "processor_aggregator" name too long ... Browse Code »

    cpi_device_class can only be 19 characters and a NULL terminator.

    With the current name we get a buffer overflow in acpi_pad_add()
    strcpy(acpi_device_class(device), ACPI_PROCESSOR_AGGREGATOR_CLASS);

    [akpm@linux-foundation.org: call it acpi_pad, per Shaohua Li]
    Signed-off-by: Dan Carpenter
    Cc: walter harms
    Acked-by: Shaohua Li
    Cc: Len Brown
    Acked-by: Pavel Machek
    Signed-off-by: Andrew Morton
    Signed-off-by: Len Brown

    Dan Carpenter
     

30 Mar, 2010

1 commit

  • 5a0e3ad6a   include cleanup: Update gfp.h and slab.h includes to prepare for breaking implic… ... Browse Code »

    …it slab.h inclusion from percpu.h

    percpu.h is included by sched.h and module.h and thus ends up being
    included when building most .c files. percpu.h includes slab.h which
    in turn includes gfp.h making everything defined by the two files
    universally available and complicating inclusion dependencies.

    percpu.h -> slab.h dependency is about to be removed. Prepare for
    this change by updating users of gfp and slab facilities include those
    headers directly instead of assuming availability. As this conversion
    needs to touch large number of source files, the following script is
    used as the basis of conversion.

    http://userweb.kernel.org/~tj/misc/slabh-sweep.py

    The script does the followings.

    * Scan files for gfp and slab usages and update includes such that
    only the necessary includes are there. ie. if only gfp is used,
    gfp.h, if slab is used, slab.h.

    * When the script inserts a new include, it looks at the include
    blocks and try to put the new include such that its order conforms
    to its surrounding. It's put in the include block which contains
    core kernel includes, in the same order that the rest are ordered -
    alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
    doesn't seem to be any matching order.

    * If the script can't find a place to put a new include (mostly
    because the file doesn't have fitting include block), it prints out
    an error message indicating which .h file needs to be added to the
    file.

    The conversion was done in the following steps.

    1. The initial automatic conversion of all .c files updated slightly
    over 4000 files, deleting around 700 includes and adding ~480 gfp.h
    and ~3000 slab.h inclusions. The script emitted errors for ~400
    files.

    2. Each error was manually checked. Some didn't need the inclusion,
    some needed manual addition while adding it to implementation .h or
    embedding .c file was more appropriate for others. This step added
    inclusions to around 150 files.

    3. The script was run again and the output was compared to the edits
    from #2 to make sure no file was left behind.

    4. Several build tests were done and a couple of problems were fixed.
    e.g. lib/decompress_*.c used malloc/free() wrappers around slab
    APIs requiring slab.h to be added manually.

    5. The script was run on all .h files but without automatically
    editing them as sprinkling gfp.h and slab.h inclusions around .h
    files could easily lead to inclusion dependency hell. Most gfp.h
    inclusion directives were ignored as stuff from gfp.h was usually
    wildly available and often used in preprocessor macros. Each
    slab.h inclusion directive was examined and added manually as
    necessary.

    6. percpu.h was updated not to include slab.h.

    7. Build test were done on the following configurations and failures
    were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
    distributed build env didn't work with gcov compiles) and a few
    more options had to be turned off depending on archs to make things
    build (like ipr on powerpc/64 which failed due to missing writeq).

    * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
    * powerpc and powerpc64 SMP allmodconfig
    * sparc and sparc64 SMP allmodconfig
    * ia64 SMP allmodconfig
    * s390 SMP allmodconfig
    * alpha SMP allmodconfig
    * um on x86_64 SMP allmodconfig

    8. percpu.h modifications were reverted so that it could be applied as
    a separate patch and serve as bisection point.

    Given the fact that I had only a couple of failures from tests on step
    6, I'm fairly confident about the coverage of this conversion patch.
    If there is a breakage, it's likely to be something in one of the arch
    headers which should be easily discoverable easily on most builds of
    the specific arch.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Tejun Heo
     

20 Jan, 2010

1 commit

31 Dec, 2009

1 commit

  • 3b8cb427e   acpi_pad: fix error checks ... Browse Code »

    There are some fixes listed below:
    1. When met a bogus BIOS, the return value of cpu number maybe is
    a negative value so that acpi_pad_pur get an unexpected result.
    2. the return value of function acpi_pad_idle_cpus is useless.
    3. enhance the process of create_power_saving_task/destroy_power_saving_task
    4. Add more error checks when evaluating _PUR object.
    5. one typo fix

    Signed-off-by: Chen Gong
    Acked-by: Shaohua Li
    Signed-off-by: Len Brown

    Chen Gong
     

16 Dec, 2009

1 commit

  • f67538f81   acpi_pad: squish warning ... Browse Code »

    drivers/acpi/acpi_pad.c: In function 'power_saving_thread':
    drivers/acpi/acpi_pad.c:103: warning: 'preferred_cpu' may be used uninitialized in this function

    Cc: Shaohua Li
    Signed-off-by: Andrew Morton
    Signed-off-by: Len Brown

    Andrew Morton
     

01 Aug, 2009

1 commit

  • 8e0af5141   ACPI: create Processor Aggregator Device driver ... Browse Code »

    ACPI 4.0 created the logical "processor aggregator device" as
    a mechinism for platforms to ask the OS to force otherwise busy
    processors to enter (power saving) idle.

    The intent is to lower power consumption to ride-out
    transient electrical and thermal emergencies,
    rather than powering off the server.

    On platforms that can save more power/performance via P-states,
    the platform will first exhaust P-states before forcing idle.
    However, the relative benefit of P-states vs. idle states
    is platform dependent, and thus this driver need not know
    or care about it.

    This driver does not use the kernel's CPU hot-plug mechanism
    because after the transient emergency is over, the system must
    be returned to its normal state, and hotplug would permanently
    break both cpusets and binding.

    So to force idle, the driver creates a power saving thread.
    The scheduler will migrate the thread to the preferred CPU.
    The thread has max priority and has SCHED_RR policy,
    so it can occupy one CPU. To save power, the thread will
    invoke the deep C-state entry instructions.

    To avoid starvation, the thread will sleep 5% of the time
    time for every second (current RT scheduler has threshold
    to avoid starvation, but if other CPUs are idle,
    the CPU can borrow CPU timer from other,
    which makes the mechanism not work here)

    Vaidyanathan Srinivasan has proposed scheduler enhancements
    to allow injecting idle time into the system. This driver doesn't
    depend on those enhancements, but could cut over to them
    when they are available.

    Peter Z. does not favor upstreaming this driver until
    the those scheduler enhancements are in place. However,
    we favor upstreaming this driver now because it is useful
    now, and can be enhanced over time.

    Signed-off-by: Shaohua Li
    NACKed-by: Peter Zijlstra
    Cc: Vaidyanathan Srinivasan
    Signed-off-by: Len Brown

    Shaohua Li