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    SubjectRe: [tip:timers/core] ARM: Kconfig: allow full nohz CPU accounting
    On Thu, Oct 03, 2013 at 06:58:03AM -0700, tip-bot for Kevin Hilman wrote:
    > Commit-ID: 31c1fc8187158cb80ccd57c19e024c55af901797
    > Gitweb: http://git.kernel.org/tip/31c1fc8187158cb80ccd57c19e024c55af901797
    > Author: Kevin Hilman <khilman@linaro.org>
    > AuthorDate: Mon, 16 Sep 2013 15:28:22 -0700
    > Committer: Frederic Weisbecker <fweisbec@gmail.com>
    > CommitDate: Mon, 30 Sep 2013 15:37:05 +0200
    >
    > ARM: Kconfig: allow full nohz CPU accounting
    >
    > With the 64-bit requirement removed from VIRT_CPU_ACCOUNTING_GEN,
    > allow ARM platforms to enable it. Since VIRT_CPU_ACCOUNTING_GEN is a
    > dependency for full NO_HZ, this allows ARM platforms to enable full
    > NO_HZ as well.

    I realize that arm doesn't implement irq work raise. It hooks on the
    timer to execute pending irq work. You'll need to implement arch_irq_work_raise()
    and implement some sort of self IPI to trigger irq work. The full dynticks subsystem
    relies on that to work correctly. It often use that to re-evaluate and possibly restart
    the tick after scheduler, posix timer updates, etc...

    That notwithstanding that if you have no tick, tick based irq work can't
    work.

    Thanks.

    >
    > Signed-off-by: Kevin Hilman <khilman@linaro.org>
    > Cc: Ingo Molnar <mingo@kernel.org>
    > Cc: Russell King <rmk@arm.linux.org.uk>
    > Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    > Cc: Arm Linux <linux-arm-kernel@lists.infradead.org>
    > Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    > ---
    > arch/arm/Kconfig | 1 +
    > 1 file changed, 1 insertion(+)
    >
    > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
    > index 1ad6fb6..323baf0 100644
    > --- a/arch/arm/Kconfig
    > +++ b/arch/arm/Kconfig
    > @@ -54,6 +54,7 @@ config ARM
    > select HAVE_REGS_AND_STACK_ACCESS_API
    > select HAVE_SYSCALL_TRACEPOINTS
    > select HAVE_UID16
    > + select HAVE_VIRT_CPU_ACCOUNTING_GEN
    > select IRQ_FORCED_THREADING
    > select KTIME_SCALAR
    > select MODULES_USE_ELF_REL


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