Eric Lee / smarc-fsl-linux-kernel

24 Feb, 2016

1 commit

  • 9fc9204ef   rcu: Make rcu/tiny_plugin.h explicitly non-modular ... Browse Code »

    The Kconfig currently controlling compilation of this code is:

    init/Kconfig:config TINY_RCU
    init/Kconfig: bool

    ...meaning that it currently is not being built as a module by anyone.

    Lets remove the modular code that is essentially orphaned, so that
    when reading the code there is no doubt it is builtin-only.

    Since module_init translates to device_initcall in the non-modular
    case, the init ordering remains unchanged with this commit. We could
    consider moving this to an earlier initcall (subsys?) if desired.

    We also delete the MODULE_LICENSE tag etc. since all that information
    is already contained at the top of the file in the comments.

    Cc: Josh Triplett
    Cc: Steven Rostedt
    Cc: Mathieu Desnoyers
    Cc: Lai Jiangshan
    Signed-off-by: Paul Gortmaker
    Signed-off-by: Paul E. McKenney

    Paul Gortmaker
     

28 May, 2015

1 commit

16 Jan, 2015

2 commits

  • 78e691f4a   Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 's… ... Browse Code »

    …rcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD

    doc.2015.01.07a: Documentation updates.
    fixes.2015.01.15a: Miscellaneous fixes.
    preempt.2015.01.06a: Changes to handling of lists of preempted tasks.
    srcu.2015.01.06a: SRCU updates.
    stall.2015.01.16a: RCU CPU stall-warning updates and fixes.
    torture.2015.01.11a: RCU torture-test updates and fixes.

    Paul E. McKenney
     
  • ec1fe396f   rcu: Fix RCU CPU stall detection in tiny implementation ... Browse Code »

    The tiny RCU CPU stall detection depends on *rcp->curtail not being
    NULL. It is however a tail pointer and thus NULL by definition. Instead we
    should check rcp->rcucblist for the presence of pending callbacks which
    need to be processed. With this fix INFO about the stall is printed and
    jiffies_stall (jiffies at next stall) correctly updated.

    Note that the check for pending callback is necessary to avoid spurious
    warnings if there are no pendings callbacks.

    Signed-off-by: Miroslav Benes
    [ paulmck: Fused identical "if" statements, ported to -rcu. ]
    Signed-off-by: Paul E. McKenney

    Miroslav Benes
     

07 Jan, 2015

1 commit

  • 5f6130fa5   tiny_rcu: Directly force QS when call_rcu_[bh|sched]() on idle_task ... Browse Code »

    For RCU in UP, context-switch = QS = GP, thus we can force a
    context-switch when any call_rcu_[bh|sched]() is happened on idle_task.
    After doing so, rcu_idle/irq_enter/exit() are useless, so we can simply
    make these functions empty.

    More important, this change does not change the functionality logically.
    Note: raise_softirq(RCU_SOFTIRQ)/rcu_sched_qs() in rcu_idle_enter() and
    outmost rcu_irq_exit() will have to wake up the ksoftirqd
    (due to in_interrupt() == 0).

    Before this patch After this patch:
    call_rcu_sched() in idle; call_rcu_sched() in idle
    set resched
    do other stuffs; do other stuffs
    outmost rcu_irq_exit() outmost rcu_irq_exit() (empty function)
    (or rcu_idle_enter()) (or rcu_idle_enter(), also empty function)
    start to resched. (see above)
    rcu_sched_qs() rcu_sched_qs()
    QS,and GP and advance cb QS,and GP and advance cb
    wake up the ksoftirqd wake up the ksoftirqd
    set resched
    resched to ksoftirqd (or other) resched to ksoftirqd (or other)

    These two code patches are almost the same.

    Size changed after patched:

    size kernel/rcu/tiny-old.o kernel/rcu/tiny-patched.o
    text data bss dec hex filename
    3449 206 8 3663 e4f kernel/rcu/tiny-old.o
    2406 144 8 2558 9fe kernel/rcu/tiny-patched.o

    Signed-off-by: Lai Jiangshan
    Signed-off-by: Paul E. McKenney

    Lai Jiangshan
     

29 Apr, 2014

1 commit

  • af952b919   rcu: Protect uses of ->jiffies_stall with ACCESS_ONCE() ... Browse Code »

    Some of the accesses to the rcu_state structure's ->jiffies_stall
    field are unprotected. This patch protects them with ACCESS_ONCE().
    The following coccinelle script was used to acheive this:
    /* coccinelle script to protect uses of ->jiffies_stall with ACCESS_ONCE() */
    @@
    identifier a;
    @@
    (
    ACCESS_ONCE(a->jiffies_stall)
    |
    - a->jiffies_stall
    + ACCESS_ONCE(a->jiffies_stall)
    )

    Signed-off-by: Himangi Saraogi
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Himangi Saraogi
     

18 Feb, 2014

1 commit

  • 87de1cfdc   rcu: Stop tracking FSF's postal address ... Browse Code »

    All of the RCU source files have the usual GPL header, which contains a
    long-obsolete postal address for FSF. To avoid the need to track the
    FSF office's movements, this commit substitutes the URL where GPL may
    be found.

    Reported-by: Greg KH
    Reported-by: Steven Rostedt
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Paul E. McKenney
     

16 Oct, 2013

1 commit