Eric Lee / smarc-fsl-linux-kernel

07 Jan, 2012

1 commit

  • 376613e81   Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip ... Browse Code »

    * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
    x86, tsc: Skip TSC synchronization checks for tsc=reliable
    clocksource: Convert tcb_clksrc to use clocksource_register_hz/khz
    clocksource: cris: Convert to clocksource_register_khz
    clocksource: xtensa: Convert to clocksource_register_hz/khz
    clocksource: um: Convert to clocksource_register_hz/khz
    clocksource: parisc: Convert to clocksource_register_hz/khz
    clocksource: m86k: Convert to clocksource_register_hz/khz
    time: x86: Replace LATCH with PIT_LATCH in i8253 clocksource driver
    time: x86: Remove CLOCK_TICK_RATE from acpi_pm clocksource driver
    time: x86: Remove CLOCK_TICK_RATE from mach_timer.h
    time: x86: Remove CLOCK_TICK_RATE from tsc code
    time: Fix spelling mistakes in new comments
    time: fix bogus comment in timekeeping_get_ns_raw

    Linus Torvalds
     

12 Dec, 2011

3 commits

  • 1268fbc74   nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu() ... Browse Code »

    Those two APIs were provided to optimize the calls of
    tick_nohz_idle_enter() and rcu_idle_enter() into a single
    irq disabled section. This way no interrupt happening in-between would
    needlessly process any RCU job.

    Now we are talking about an optimization for which benefits
    have yet to be measured. Let's start simple and completely decouple
    idle rcu and dyntick idle logics to simplify.

    Signed-off-by: Frederic Weisbecker
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: Peter Zijlstra
    Reviewed-by: Josh Triplett
    Signed-off-by: Paul E. McKenney

    Frederic Weisbecker
     
  • 2bbb6817c   nohz: Allow rcu extended quiescent state handling seperately from tick stop ... Browse Code »

    It is assumed that rcu won't be used once we switch to tickless
    mode and until we restart the tick. However this is not always
    true, as in x86-64 where we dereference the idle notifiers after
    the tick is stopped.

    To prepare for fixing this, add two new APIs:
    tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().

    If no use of RCU is made in the idle loop between
    tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
    must instead call the new *_norcu() version such that the arch doesn't
    need to call rcu_idle_enter() and rcu_idle_exit().

    Otherwise the arch must call tick_nohz_enter_idle() and
    tick_nohz_exit_idle() and also call explicitly:

    - rcu_idle_enter() after its last use of RCU before the CPU is put
    to sleep.
    - rcu_idle_exit() before the first use of RCU after the CPU is woken
    up.

    Signed-off-by: Frederic Weisbecker
    Cc: Mike Frysinger
    Cc: Guan Xuetao
    Cc: David Miller
    Cc: Chris Metcalf
    Cc: Hans-Christian Egtvedt
    Cc: Ralf Baechle
    Cc: Paul E. McKenney
    Cc: Ingo Molnar
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: H. Peter Anvin
    Cc: Russell King
    Cc: Paul Mackerras
    Cc: Heiko Carstens
    Cc: Paul Mundt
    Signed-off-by: Paul E. McKenney

    Frederic Weisbecker
     
  • 280f06774   nohz: Separate out irq exit and idle loop dyntick logic ... Browse Code »

    The tick_nohz_stop_sched_tick() function, which tries to delay
    the next timer tick as long as possible, can be called from two
    places:

    - From the idle loop to start the dytick idle mode
    - From interrupt exit if we have interrupted the dyntick
    idle mode, so that we reprogram the next tick event in
    case the irq changed some internal state that requires this
    action.

    There are only few minor differences between both that
    are handled by that function, driven by the ts->inidle
    cpu variable and the inidle parameter. The whole guarantees
    that we only update the dyntick mode on irq exit if we actually
    interrupted the dyntick idle mode, and that we enter in RCU extended
    quiescent state from idle loop entry only.

    Split this function into:

    - tick_nohz_idle_enter(), which sets ts->inidle to 1, enters
    dynticks idle mode unconditionally if it can, and enters into RCU
    extended quiescent state.

    - tick_nohz_irq_exit() which only updates the dynticks idle mode
    when ts->inidle is set (ie: if tick_nohz_idle_enter() has been called).

    To maintain symmetry, tick_nohz_restart_sched_tick() has been renamed
    into tick_nohz_idle_exit().

    This simplifies the code and micro-optimize the irq exit path (no need
    for local_irq_save there). This also prepares for the split between
    dynticks and rcu extended quiescent state logics. We'll need this split to
    further fix illegal uses of RCU in extended quiescent states in the idle
    loop.

    Signed-off-by: Frederic Weisbecker
    Cc: Mike Frysinger
    Cc: Guan Xuetao
    Cc: David Miller
    Cc: Chris Metcalf
    Cc: Hans-Christian Egtvedt
    Cc: Ralf Baechle
    Cc: Paul E. McKenney
    Cc: Ingo Molnar
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: H. Peter Anvin
    Cc: Russell King
    Cc: Paul Mackerras
    Cc: Heiko Carstens
    Cc: Paul Mundt
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Frederic Weisbecker
     

06 Dec, 2011

1 commit

22 Nov, 2011

1 commit

02 Nov, 2011

8 commits

15 Sep, 2011

2 commits

  • f2833aef6   um: clean arch_ptrace() up a bit ... Browse Code »

    1) take subarch-specific stuff to subarch_ptrace()
    2) PTRACE_{PEEK,POKE}{TEXT,DATA} is handled by ptrace_request() just fine...

    Signed-off-by: Al Viro
    Signed-off-by: Richard Weinberger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Al Viro
     
  • fbfe9c847   um: Save FPU registers between task switches ... Browse Code »

    Some time ago Jeff prepared 42daba316557 ("uml: stop saving process FP
    state") for UML to stop saving the process FP state between task
    switches. The assumption was that since with SKAS0 every guest process
    runs inside a host process context the host OS will take care of keeping
    the proper FP state.

    Unfortunately this is not true for multi-threaded applications, where
    all guest threads share a single host process context yet all may use
    the FPU on their own. Although I haven't verified it I suspect things
    to be even worse in SKAS3 mode where all guest processes run inside a
    single host process.

    The patch reintroduces the saving and restoring of the FP context
    between task switches.

    [richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied
    and got lost. Now in 2011 the problem was reported by Gunnar.]

    Signed-off-by: Ingo van Lil
    Signed-off-by: Richard Weinberger
    Reported-by:
    Tested-by:
    Cc: Stanislav Meduna
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo van Lil
     

26 Jul, 2011

2 commits

25 May, 2011

3 commits

14 Apr, 2011

1 commit

  • 184748cc5   sched: Provide scheduler_ipi() callback in response to smp_send_reschedule() ... Browse Code »

    For future rework of try_to_wake_up() we'd like to push part of that
    function onto the CPU the task is actually going to run on.

    In order to do so we need a generic callback from the existing scheduler IPI.

    This patch introduces such a generic callback: scheduler_ipi() and
    implements it as a NOP.

    BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions!

    Acked-by: Russell King
    Acked-by: Martin Schwidefsky
    Acked-by: Chris Metcalf
    Acked-by: Jesper Nilsson
    Acked-by: Benjamin Herrenschmidt
    Signed-off-by: Ralf Baechle
    Reviewed-by: Frank Rowand
    Cc: Mike Galbraith
    Cc: Nick Piggin
    Cc: Linus Torvalds
    Cc: Andrew Morton
    Signed-off-by: Ingo Molnar
    Signed-off-by: Peter Zijlstra
    Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl

    Peter Zijlstra
     

25 Mar, 2011

2 commits

15 Feb, 2011

3 commits

14 Jan, 2011

1 commit

  • 8ac1f8320   thp: pte alloc trans splitting ... Browse Code »

    pte alloc routines must wait for split_huge_page if the pmd is not present
    and not null (i.e. pmd_trans_splitting). The additional branches are
    optimized away at compile time by pmd_trans_splitting if the config option
    is off. However we must pass the vma down in order to know the anon_vma
    lock to wait for.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Andrea Arcangeli
    Acked-by: Rik van Riel
    Acked-by: Mel Gorman
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andrea Arcangeli
     

18 Nov, 2010

1 commit

12 Nov, 2010

1 commit

  • 8818b6719   um: fix ptrace build error ... Browse Code »

    Both commits 0a3d763f1a68 ("ptrace: cleanup arch_ptrace() on um") and
    9b05a69e0534 ("ptrace: change signature of arch_ptrace()") broke the um
    build. This patch fixes the issues.

    0a3d763f1a68 introduced the undeclared variable "datavp". The patch seems
    completely untested. :-(

    9b05a69e0534 changed arch_ptrace()'s signature but did not update
    um/include/asm/ptrace-generic.h.

    Signed-off-by: Richard Weinberger
    Cc: Namhyung Kim
    Cc: Jeff Dike
    Tested-by: Will Newton
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     

28 Oct, 2010

2 commits

  • 0a3d763f1   ptrace: cleanup arch_ptrace() on um ... Browse Code »

    Remove unnecessary castings using void pointer and fix copy_to_user()
    return value. Also add missing __user markup on the argument of
    arch_ptrctl().

    Signed-off-by: Namhyung Kim
    Cc: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Namhyung Kim
     
  • 9b05a69e0   ptrace: change signature of arch_ptrace() ... Browse Code »

    Fix up the arguments to arch_ptrace() to take account of the fact that
    @addr and @data are now unsigned long rather than long as of a preceding
    patch in this series.

    Signed-off-by: Namhyung Kim
    Cc:
    Acked-by: Roland McGrath
    Acked-by: David Howells
    Acked-by: Geert Uytterhoeven
    Acked-by: David S. Miller
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Namhyung Kim
     

27 Oct, 2010

3 commits

  • be76d81f9   um: migrate from __do_IRQ() to generic_handle_irq() ... Browse Code »

    This patch removes __do_IRQ() from user mode linux. __do_IRQ is deprecated.

    Signed-off-by: Richard Weinberger
    Cc: Jeff Dike
    Cc: Thomas Gleixner
    Cc: Peter Zijlstra
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     
  • aa5fb4dbf   uml: fix CONFIG_STATIC_LINK=y build failure with newer glibc ... Browse Code »

    With glibc 2.11 or later that was built with --enable-multi-arch, the UML
    link fails with undefined references to __rel_iplt_start and similar
    symbols. In recent binutils, the default linker script defines these
    symbols (see ld --verbose). Fix the UML linker scripts to match the new
    defaults for these sections.

    Signed-off-by: Roland McGrath
    Cc: Jeff Dike
    Cc: Al Viro
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Roland McGrath
     
  • 6915e04f8   um: remove PAGE_SIZE alignment in linker script causing kernel segfault. ... Browse Code »

    The linker script cleanup that I did in commit 5d150a97f93 ("um: Clean up
    linker script using standard macros.") (2.6.32) accidentally introduced an
    ALIGN(PAGE_SIZE) when converting to use INIT_TEXT_SECTION; Richard
    Weinberger reported that this causes the kernel to segfault with
    CONFIG_STATIC_LINK=y.

    I'm not certain why this extra alignment is a problem, but it seems likely
    it is because previously

    __init_begin = _stext = _text = _sinittext

    and with the extra ALIGN(PAGE_SIZE), _sinittext becomes different from the
    rest. So there is likely a bug here where something is assuming that
    _sinittext is the same as one of those other symbols. But reverting the
    accidental change fixes the regression, so it seems worth committing that
    now.

    Signed-off-by: Tim Abbott
    Reported-by: Richard Weinberger
    Cc: Jeff Dike
    Tested by: Antoine Martin
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     

23 Oct, 2010

1 commit

  • 5704e44d2   Merge branch 'config' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl ... Browse Code »

    * 'config' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl:
    BKL: introduce CONFIG_BKL.
    dabusb: remove the BKL
    sunrpc: remove the big kernel lock
    init/main.c: remove BKL notations
    blktrace: remove the big kernel lock
    rtmutex-tester: make it build without BKL
    dvb-core: kill the big kernel lock
    dvb/bt8xx: kill the big kernel lock
    tlclk: remove big kernel lock
    fix rawctl compat ioctls breakage on amd64 and itanic
    uml: kill big kernel lock
    parisc: remove big kernel lock
    cris: autoconvert trivial BKL users
    alpha: kill big kernel lock
    isapnp: BKL removal
    s390/block: kill the big kernel lock
    hpet: kill BKL, add compat_ioctl

    Linus Torvalds
     

19 Oct, 2010

1 commit

  • 9a181c586   uml: kill big kernel lock ... Browse Code »

    Three uml device drivers still use the big kernel lock,
    but all of them can be safely converted to using
    a per-driver mutex instead. Most likely this is not
    even necessary, so after further review these can
    and should be removed as well.

    The exec system call no longer requires the BKL either,
    so remove it from there, too.

    Signed-off-by: Arnd Bergmann
    Cc: Jeff Dike
    Cc: user-mode-linux-devel@lists.sourceforge.net

    Arnd Bergmann
     

12 Oct, 2010

1 commit

24 Sep, 2010

1 commit

23 Sep, 2010

1 commit

  • cb1dcc0ff   uml: fix compile warning ... Browse Code »

    This fixes:
    incompatible pointer type: => 89
    arch/um/kernel/exec.c: warning: passing argument 2 of 'execve1' from
    incompatible pointer type: => 69, 85
    arch/um/kernel/exec.c: warning: passing argument 3 of 'execve1' from
    incompatible pointer type: => 69, 85

    which was introduced by d7627467b7a8d ("Make do_execve() take a const
    filename pointer")

    Signed-off-by: Richard Weinberger
    Cc: David Howells
    Cc: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger