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