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2013-05-20ftrace-migrate-disable-tracing.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-migrate-disable.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20hotplug: Lightweight get online cpusThomas Gleixner
get_online_cpus() is a heavy weight function which involves a global mutex. migrate_disable() wants a simpler construct which prevents only a CPU from going doing while a task is in a migrate disabled section. Implement a per cpu lockless mechanism, which serializes only in the real unplug case on a global mutex. That serialization affects only tasks on the cpu which should be brought down. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20stomp-machine-mark-stomper-thread.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20cond-resched-lock-rt-tweak.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-no-work-when-pi-blocked.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20cond-resched-softirq-fix.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-might-sleep-do-not-account-rcu-depth.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-rt-mutex-wakeup.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-mmdrop-delayed.patchThomas Gleixner
Needs thread context (pgd_lock) -> ifdeffed. workqueues wont work with RT Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched-delay-put-task.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20posix-timers: thread posix-cpu-timers on -rtJohn Stultz
posix-cpu-timer code takes non -rt safe locks in hard irq context. Move it to a thread. [ 3.0 fixes from Peter Zijlstra <peterz@infradead.org> ] Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20hrtimer: fixup hrtimer callback changes for preempt-rtThomas Gleixner
In preempt-rt we can not call the callbacks which take sleeping locks from the timer interrupt context. Bring back the softirq split for now, until we fixed the signal delivery problem for real. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2013-05-20hrtimers: prepare full preemptionIngo Molnar
Make cancellation of a running callback in softirq context safe against preemption. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20timers: prepare for full preemptionIngo Molnar
When softirqs can be preempted we need to make sure that cancelling the timer from the active thread can not deadlock vs. a running timer callback. Add a waitqueue to resolve that. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20radix-tree-rt-aware.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20mm: shrink the page frame to !-rt sizePeter Zijlstra
He below is a boot-tested hack to shrink the page frame size back to normal. Should be a net win since there should be many less PTE-pages than page-frames. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20mm: make vmstat -rt awareIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20cpu-rt-variants.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20rt-local-irq-lock.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20local-var.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20genirq-force-threading.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20fs: jbd/jbd2: Make state lock and journal head lock rt safeThomas Gleixner
bit_spin_locks break under RT. Based on a previous patch from Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> -- include/linux/buffer_head.h | 10 ++++++++++ include/linux/jbd_common.h | 24 ++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
2013-05-20buffer_head: Replace bh_uptodate_lock for -rtThomas Gleixner
Wrap the bit_spin_lock calls into a separate inline and add the RT replacements with a real spinlock. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20mm: Replace cgroup_page bit spinlockThomas Gleixner
Bit spinlocks are not working on RT. Replace them. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20preempt: Provide preempt_*_(no)rt variantsThomas Gleixner
RT needs a few preempt_disable/enable points which are not necessary otherwise. Implement variants to avoid #ifdeffery. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20rt: local_irq_* variants depending on RT/!RTThomas Gleixner
Add local_irq_*_(no)rt variant which are mainly used to break interrupt disabled sections on PREEMPT_RT or to explicitely disable interrupts on PREEMPT_RT. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20bug: BUG_ON/WARN_ON variants dependend on RT/!RTIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20printk-kill.patchIngo Molnar
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20early-printk-consolidate.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20latency-hist.patchCarsten Emde
This patch provides a recording mechanism to store data of potential sources of system latencies. The recordings separately determine the latency caused by a delayed timer expiration, by a delayed wakeup of the related user space program and by the sum of both. The histograms can be enabled and reset individually. The data are accessible via the debug filesystem. For details please consult Documentation/trace/histograms.txt. Signed-off-by: Carsten Emde <C.Emde@osadl.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20wait: Provide __wake_up_all_lockedThomas Gleixner
For code which protects the waitqueue itself with another lock it makes no sense to acquire the waitqueue lock for wakeup all. Provide __wake_up_all_locked. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable-rt@vger.kernel.org
2013-05-20locking-various-init-fixes.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20softirq-thread-do-softirq.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sysctl-include-fix.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20rwsem-inlcude-fix.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20list-add-list-last-entry.patchPeter Zijlstra
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20of-convert-devtree-lock.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20suspend: Prevent might sleep splatsThomas Gleixner
timekeeping suspend/resume calls read_persistant_clock() which takes rtc_lock. That results in might sleep warnings because at that point we run with interrupts disabled. We cannot convert rtc_lock to a raw spinlock as that would trigger other might sleep warnings. As a temporary workaround we disable the might sleep warnings by setting system_state to SYSTEM_SUSPEND before calling sysdev_suspend() and restoring it to SYSTEM_RUNNING afer sysdev_resume(). Needs to be revisited. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20mm: raw_pagefault_disablePeter Zijlstra
Adding migrate_disable() to pagefault_disable() to preserve the per-cpu thing for kmap_atomic might not have been the best of choices. But short of adding preempt_disable/migrate_disable foo all over the kmap code it still seems the best way. It does however yield the below borkage as well as wreck !-rt builds since !-rt does rely on pagefault_disable() not preempting. So fix all that up by adding raw_pagefault_disable(). <NMI> [<ffffffff81076d5c>] warn_slowpath_common+0x85/0x9d [<ffffffff81076e17>] warn_slowpath_fmt+0x46/0x48 [<ffffffff814f7fca>] ? _raw_spin_lock+0x6c/0x73 [<ffffffff810cac87>] ? watchdog_overflow_callback+0x9b/0xd0 [<ffffffff810caca3>] watchdog_overflow_callback+0xb7/0xd0 [<ffffffff810f51bb>] __perf_event_overflow+0x11c/0x1fe [<ffffffff810f298f>] ? perf_event_update_userpage+0x149/0x151 [<ffffffff810f2846>] ? perf_event_task_disable+0x7c/0x7c [<ffffffff810f5b7c>] perf_event_overflow+0x14/0x16 [<ffffffff81046e02>] x86_pmu_handle_irq+0xcb/0x108 [<ffffffff814f9a6b>] perf_event_nmi_handler+0x46/0x91 [<ffffffff814fb2ba>] notifier_call_chain+0x79/0xa6 [<ffffffff814fb34d>] __atomic_notifier_call_chain+0x66/0x98 [<ffffffff814fb2e7>] ? notifier_call_chain+0xa6/0xa6 [<ffffffff814fb393>] atomic_notifier_call_chain+0x14/0x16 [<ffffffff814fb3c3>] notify_die+0x2e/0x30 [<ffffffff814f8f75>] do_nmi+0x7e/0x22b [<ffffffff814f8bca>] nmi+0x1a/0x2c [<ffffffff814fb130>] ? sub_preempt_count+0x4b/0xaa <<EOE>> <IRQ> [<ffffffff812d44cc>] delay_tsc+0xac/0xd1 [<ffffffff812d4399>] __delay+0xf/0x11 [<ffffffff812d95d9>] do_raw_spin_lock+0xd2/0x13c [<ffffffff814f813e>] _raw_spin_lock_irqsave+0x6b/0x85 [<ffffffff8106772a>] ? task_rq_lock+0x35/0x8d [<ffffffff8106772a>] task_rq_lock+0x35/0x8d [<ffffffff8106fe2f>] migrate_disable+0x65/0x12c [<ffffffff81114e69>] pagefault_disable+0xe/0x1f [<ffffffff81039c73>] dump_trace+0x21f/0x2e2 [<ffffffff8103ad79>] show_trace_log_lvl+0x54/0x5d [<ffffffff8103ad97>] show_trace+0x15/0x17 [<ffffffff814f4f5f>] dump_stack+0x77/0x80 [<ffffffff812d94b0>] spin_bug+0x9c/0xa3 [<ffffffff81067745>] ? task_rq_lock+0x50/0x8d [<ffffffff812d954e>] do_raw_spin_lock+0x47/0x13c [<ffffffff814f7fbe>] _raw_spin_lock+0x60/0x73 [<ffffffff81067745>] ? task_rq_lock+0x50/0x8d [<ffffffff81067745>] task_rq_lock+0x50/0x8d [<ffffffff8106fe2f>] migrate_disable+0x65/0x12c [<ffffffff81114e69>] pagefault_disable+0xe/0x1f [<ffffffff81039c73>] dump_trace+0x21f/0x2e2 [<ffffffff8104369b>] save_stack_trace+0x2f/0x4c [<ffffffff810a7848>] save_trace+0x3f/0xaf [<ffffffff810aa2bd>] mark_lock+0x228/0x530 [<ffffffff810aac27>] __lock_acquire+0x662/0x1812 [<ffffffff8103dad4>] ? native_sched_clock+0x37/0x6d [<ffffffff810a790e>] ? trace_hardirqs_off_caller+0x1f/0x99 [<ffffffff810693f6>] ? sched_rt_period_timer+0xbd/0x218 [<ffffffff810ac403>] lock_acquire+0x145/0x18a [<ffffffff810693f6>] ? sched_rt_period_timer+0xbd/0x218 [<ffffffff814f7f9e>] _raw_spin_lock+0x40/0x73 [<ffffffff810693f6>] ? sched_rt_period_timer+0xbd/0x218 [<ffffffff810693f6>] sched_rt_period_timer+0xbd/0x218 [<ffffffff8109aa39>] __run_hrtimer+0x1e4/0x347 [<ffffffff81069339>] ? can_migrate_task.clone.82+0x14a/0x14a [<ffffffff8109b97c>] hrtimer_interrupt+0xee/0x1d6 [<ffffffff814fb23d>] ? add_preempt_count+0xae/0xb2 [<ffffffff814ffb38>] smp_apic_timer_interrupt+0x85/0x98 [<ffffffff814fef13>] apic_timer_interrupt+0x13/0x20 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-31keae8mkjiv8esq4rl76cib@git.kernel.org
2013-05-20mm: pagefault_disabled()Peter Zijlstra
Wrap the test for pagefault_disabled() into a helper, this allows us to remove the need for current->pagefault_disabled on !-rt kernels. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-3yy517m8zsi9fpsf14xfaqkw@git.kernel.org
2013-05-20mm: Prepare decoupling the page fault disabling logicIngo Molnar
Add a pagefault_disabled variable to task_struct to allow decoupling the pagefault-disabled logic from the preempt count. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20preempt-mark-legitimated-no-resched-sites.patchThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20generic: Use raw local irq variant for generic cmpxchgIngo Molnar
No point in tracing those. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20signal/x86: Delay calling signals in atomicOleg Nesterov
On x86_64 we must disable preemption before we enable interrupts for stack faults, int3 and debugging, because the current task is using a per CPU debug stack defined by the IST. If we schedule out, another task can come in and use the same stack and cause the stack to be corrupted and crash the kernel on return. When CONFIG_PREEMPT_RT_FULL is enabled, spin_locks become mutexes, and one of these is the spin lock used in signal handling. Some of the debug code (int3) causes do_trap() to send a signal. This function calls a spin lock that has been converted to a mutex and has the possibility to sleep. If this happens, the above issues with the corrupted stack is possible. Instead of calling the signal right away, for PREEMPT_RT and x86_64, the signal information is stored on the stacks task_struct and TIF_NOTIFY_RESUME is set. Then on exit of the trap, the signal resume code will send the signal when preemption is enabled. [ rostedt: Switched from #ifdef CONFIG_PREEMPT_RT_FULL to ARCH_RT_DELAYS_SIGNAL_SEND and added comments to the code. ] Cc: stable-rt@vger.kernel.org Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20signals: Allow rt tasks to cache one sigqueue structThomas Gleixner
To avoid allocation allow rt tasks to cache one sigqueue struct in task struct. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20sched: Create schedule_preempt_disabled()Thomas Gleixner
Get rid of the ever repeating: preempt_enable_no_resched(); schedule(); preempt_disable(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20seqlock: Use seqcountThomas Gleixner
No point in having different implementations for the same thing. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-20seqlock: Remove unused functionsThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-13netfilter: don't reset nf_trace in nf_reset()Patrick McHardy
[ Upstream commit 124dff01afbdbff251f0385beca84ba1b9adda68 ] Commit 130549fe ("netfilter: reset nf_trace in nf_reset") added code to reset nf_trace in nf_reset(). This is wrong and unnecessary. nf_reset() is used in the following cases: - when passing packets up the the socket layer, at which point we want to release all netfilter references that might keep modules pinned while the packet is queued. nf_trace doesn't matter anymore at this point. - when encapsulating or decapsulating IPsec packets. We want to continue tracing these packets after IPsec processing. - when passing packets through virtual network devices. Only devices on that encapsulate in IPv4/v6 matter since otherwise nf_trace is not used anymore. Its not entirely clear whether those packets should be traced after that, however we've always done that. - when passing packets through virtual network devices that make the packet cross network namespace boundaries. This is the only cases where we clearly want to reset nf_trace and is also what the original patch intended to fix. Add a new function nf_reset_trace() and use it in dev_forward_skb() to fix this properly. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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