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

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

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.

							Thanx, Paul