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    SubjectRe: [tip:sched/urgent] sched: Teach might_sleep() about preemptible RCU
    On Wed, Dec 16, 2009 at 07:30:20AM -0800, Paul E. McKenney wrote:
    > On Wed, Dec 16, 2009 at 03:25:36PM +0100, Ingo Molnar wrote:
    > >
    > > * tip-bot for Frederic Weisbecker <fweisbec@gmail.com> wrote:
    > >
    > > > Commit-ID: ba1b1cbcc9b458c4b9ebb28c9cf6a2ccf64ba1cd
    > > > Gitweb: http://git.kernel.org/tip/ba1b1cbcc9b458c4b9ebb28c9cf6a2ccf64ba1cd
    > > > Author: Frederic Weisbecker <fweisbec@gmail.com>
    > > > AuthorDate: Mon, 14 Dec 2009 23:44:32 +0100
    > > > Committer: Ingo Molnar <mingo@elte.hu>
    > > > CommitDate: Wed, 16 Dec 2009 08:43:16 +0100
    > > >
    > > > sched: Teach might_sleep() about preemptible RCU
    > >
    > > Causes a build failure, so skipped this patch for now:
    > >
    > > kernel/sched.c:9661: error: implicit declaration of function 'rcu_preempt_depth'
    >
    > I guess my testing missed something. :-/ Could you please send the
    > .config file that caused this?
    >
    > Thanx, Paul


    Looks like the problem is here:

    rcupdate.h:

    #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
    #include <linux/rcutree.h>
    #elif defined(CONFIG_TINY_RCU)
    #include <linux/rcutiny.h>

    I guess it barfs in rcutiny configs.

    I should define these helpers in rcupdate.



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