On Thu, Jun 04, 2015 at 12:55:36PM +0800, Fengguang Wu wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > commit b30f0e3ffedfa52b1d67a302ae5860c49998e5e2 > Author: Frederic Weisbecker <[email protected]> > AuthorDate: Tue May 12 16:41:49 2015 +0200 > Commit: Ingo Molnar <[email protected]> > CommitDate: Tue May 19 08:39:12 2015 +0200 > > sched/preempt: Optimize preemption operations on __schedule() callers > > __schedule() disables preemption and some of its callers > (the preempt_schedule*() family) also set PREEMPT_ACTIVE. > > So we have two preempt_count() modifications that could be performed > at once. > > Lets remove the preemption disablement from __schedule() and pull > this responsibility to its callers in order to optimize preempt_count() > operations in a single place. > > Suggested-by: Linus Torvalds <[email protected]> > Signed-off-by: Frederic Weisbecker <[email protected]> > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Link: > http://lkml.kernel.org/r/[email protected] > Signed-off-by: Ingo Molnar <[email protected]>
Frederic said that he was working on the issue and we should expect patches shortly. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
