linux-kernel - Re: [rcu:rcu/next 25/36] include/linux/irqflags.h:79:3: error: implicit declaration of function 'arch_irqs_disabled

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Date:   Wed, 14 Dec 2016 16:16:23 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Richard Weinberger <richard@....at>
Cc:     kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, jdike@...toit.com,
        user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [rcu:rcu/next 25/36] include/linux/irqflags.h:79:3: error:
 implicit declaration of function 'arch_irqs_disabled_flags'

On Wed, Dec 14, 2016 at 10:54:54PM +0100, Richard Weinberger wrote:
> Paul,
> 
> On 08.08.2016 22:35, Paul E. McKenney wrote:
> > On Mon, Aug 08, 2016 at 10:12:11PM +0200, Richard Weinberger wrote:
> >> Paul,
> >>
> >> Am 15.06.2016 um 14:45 schrieb Paul E. McKenney:
> >>> On Wed, Jun 15, 2016 at 09:05:37AM +0200, Richard Weinberger wrote:
> >>>> Paul,
> >>>>
> >>>> Am 15.06.2016 um 00:54 schrieb Paul E. McKenney:
> >>>>> On Mon, Jun 06, 2016 at 02:04:03AM +0800, kbuild test robot wrote:
> >>>>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
> >>>>>> head:   13ee0de9cd2444b57ce30c4f1607b49b90aa0c38
> >>>>>> commit: f251ac814fc5787765009e60d54a2bd4277350c8 [25/36] rcu: Make call_rcu_tasks() tolerate first call with irqs disabled
> >>>>>> config: um-allmodconfig (attached as .config)
> >>>>>> compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
> >>>>>> reproduce:
> >>>>>>         git checkout f251ac814fc5787765009e60d54a2bd4277350c8
> >>>>>>         # save the attached .config to linux build tree
> >>>>>>         make ARCH=um 
> >>>>>
> >>>>> My kneejerk reaction would be to make CONFIG_TASKS_RCU depend on
> >>>>> !UML or something similar.
> >>>>>
> >>>>> Another approach would be create a arch_irqs_disabled_flags() for UML.
> >>>>>
> >>>>> Any preferences?
> >>>>
> >>>> Patches for arch_irqs_disabled_flags() support are already on LKML:
> >>>> https://lkml.org/lkml/2016/6/12/162
> >>>>
> >>>> My plan was to merge them in the v4.8 merge window.
> >>>> So having CONFIG_TASKS_RCU depend on !UML for now should be fine.
> >>>> We can remove the dependency in v4.8 again.
> >>>
> >>> Sounds very good, thank you!
> >>
> >> The patch is now in Linus' tree. So, you can enable CONFIG_TASKS_RCU
> >> for UML again. :-)
> > 
> > Very good, thank you!  I have a patch slated for the next merge window.
> > If you need it sooner, please let me know.
> 
> Just noticed that CONFIG_TASKS_RCU is still disabled for UML in today's
> next. Is there something missing in UML?

Ah -- I tried enabling it some time back, but things had not yet
propagated to mainline.  I just enabled it again, and hopefully this
time 0day will be OK with  it.

Thank you for the reminder!

							Thanx, Paul