On Thu, 28 May 2015 11:05:58 -0400
Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> wrote:
> On 15-05-20 10:55 AM, Steven Rostedt wrote:
> >
> > Dear RT Folks,
> >
> > I'm pleased to announce the 3.14.39-rt38 stable release.
>
> [...]
>
> >
> > Changes from v3.14.39-rt37:
> >
> > ---
> >
> > Marcelo Tosatti (2):
> > KVM: lapic: mark LAPIC timer handler as irqsafe
> > KVM: use simple waitqueue for vcpu->wq
> >
> > Mike Galbraith (2):
> > hotplug: Use set_cpus_allowed_ptr() in sync_unplug_thread()
> > rt, nohz_full: fix nohz_full for PREEMPT_RT_FULL
> >
> > Sebastian Andrzej Siewior (1):
> > kernel/irq_work: fix no_hz deadlock
>
> Seems we can't use this commit above as-is on 3.14 (and earlier?)
> since we'll get this:
>
> kernel/time/tick-sched.c: In function ‘can_stop_full_tick’:
> kernel/time/tick-sched.c:183:2: error: implicit declaration of function ‘arch_irq_work_has_interrupt’ [-Werror=implicit-function-declaration]
> if (!arch_irq_work_has_interrupt()) {
> ^
> cc1: some warnings being treated as errors
> make[2]: *** [kernel/time/tick-sched.o] Error 1
>
> Problem arises because that fcn doesn't come in until 3.18+ with
> the merge v3.18-rc1~114 (in the 2nd commit):
>
> git log --oneline --reverse v3.18-rc1~114^2 ^v3.18-rc1~114^
> a80e49e2cc31 nohz: Move nohz full init call to tick init
> c5c38ef3d703 irq_work: Introduce arch_irq_work_has_interrupt()
> 76a33061b932 irq_work: Force raised irq work to run on irq work interrupt
> 3010279f0fc3 x86: Tell irq work about self IPI support
> 09f6edd42421 arm: Tell irq work about self IPI support
> 3631073659d0 arm64: Tell irq work about self IPI support
> 4327b15f64b2 nohz: Consolidate nohz full init code
> 9b01f5bf3999 nohz: nohz full depends on irq work self IPI support
>
> Not sure whether we want to backport more stuff or change the
> original backport to not use arch_irq_work_has_interrupt...
>
> Config is basically a defconfig but with RT_FULL and NOHZ_FULL =y.
Grumble, I need to add NOHZ_FULL to my test configs. OK, I'll have to
look into this. Thanks for the report.
-- Steve
>
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