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2014-12-08x86/kconfig/defconfig: Enable CONFIG_FHANDLE=yRichard Weinberger2-0/+2
systemd has a hard dependency on CONFIG_FHANDLE. If you run systemd with CONFIG_FHANDLE=n it will somehow boot but fail to spawn a getty or other basic services. As systemd is now used by most x86 distributions it makes sense to enabled this by default and save kernel hackers a lot of value debugging time. Signed-off-by: Richard Weinberger <richard@nod.at> Cc: gregkh@linuxfoundation.org Cc: rafael.j.wysocki@intel.com Cc: pebolle@tiscali.nl Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/1416958612-7448-1-git-send-email-richard@nod.at Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-12-08x86: Replace seq_printf() with seq_puts()Rasmus Villemoes4-35/+33
seq_puts is a lot cheaper than seq_printf, so use that to print literal strings. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: http://lkml.kernel.org/r/1417208622-12264-1-git-send-email-linux@rasmusvillemoes.dk Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-12-08sched: Add missing rcu protection to wake_up_all_idle_cpusAndy Lutomirski1-2/+7
Locklessly doing is_idle_task(rq->curr) is only okay because of RCU protection. The older variant of the broken code checked rq->curr == rq->idle instead and therefore didn't need RCU. Fixes: f6be8af1c95d ("sched: Add new API wake_up_if_idle() to wake up the idle cpu") Signed-off-by: Andy Lutomirski <luto@amacapital.net> Reviewed-by: Chuansheng Liu <chuansheng.liu@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/729365dddca178506dfd0a9451006344cd6808bc.1417277372.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-12-08x86/ticketlock: Fix spin_unlock_wait() livelockOleg Nesterov1-1/+13
arch_spin_unlock_wait() looks very suboptimal, to the point I think this is just wrong and can lead to livelock: if the lock is heavily contended we can never see head == tail. But we do not need to wait for arch_spin_is_locked() == F. If it is locked we only need to wait until the current owner drops this lock. So we could simply spin until old_head != lock->tickets.head in this case, but .head can overflow and thus we can't check "unlocked" only once before the main loop. Also, the "unlocked" check can ignore TICKET_SLOWPATH_FLAG bit. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Paul E.McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Waiman Long <Waiman.Long@hp.com> Link: http://lkml.kernel.org/r/20141201213417.GA5842@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-12-08x86/mce: Spell "panicked" correctlyBorislav Petkov1-6/+6
We need the additional "k" to make it a hard-c: https://en.wiktionary.org/wiki/panicked Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1417642605-15730-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-12-08mfd: rtsx: Add func to split u32 into registerMicky Ching1-0/+9
Add helper function to write u32 to registers, if we want to put u32 value to 4 continuous register, this can help us reduce tedious work. Signed-off-by: Micky Ching <micky_ching@realsil.com.cn> Signed-off-by: Lee Jones <lee.jones@linaro.org>