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. :-) Thanks, //richard