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* pipe: change the ->pin() operation to ->confirm()Jens Axboe2007-07-101-1/+1
| | | | | | | | | | | | The name 'pin' was badly chosen, it doesn't pin a pipe buffer in the most commonly used sense in the kernel. So change the name to 'confirm', after debating this issue with Hugh Dickins a bit. A good return from ->confirm() means that the buffer is really there, and that the contents are good. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* relay: use splice_to_pipe() instead of open-coding the pipe loopJens Axboe2007-07-101-91/+55
| | | | | | | | | | It cleans up the relay splice implementation a lot, and gets rid of a lot of internal pipe knowledge that should not be in there. Plus fixes for padding and partial first page (and lots more) from Tom Zanussi. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* splice: divorce the splice structure/function definitions from the pipe headerJens Axboe2007-07-101-1/+1
| | | | | | | | | We need to move even more stuff into the header so that folks can use the splice_to_pipe() implementation instead of open-coding a lot of pipe knowledge (see relay implementation), so move to our own header file finally. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* splice: relay supportTom Zanussi2007-07-101-50/+191
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* sched: add CFS creditsIngo Molnar2007-07-091-0/+6
| | | | | | | | | | | add credits for recent major scheduler contributions: Con Kolivas, for pioneering the fair-scheduling approach Peter Williams, for smpnice Mike Galbraith, for interactivity tuning of CFS Srivatsa Vaddagiri, for group scheduling enhancements Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up sleep_on() APIsIngo Molnar2007-07-091-30/+41
| | | | | | | | | clean up the sleep_on() APIs: - do not use fastcall - replace fragile macro magic with proper inline functions Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: style cleanupsIngo Molnar2007-07-091-6/+7
| | | | | | | 4 small style cleanups to sched.c: checkpatch.pl is now happy about the totality of sched.c [ignoring false positives] - yay! ;-) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: do not set softirqs to nice +19Ingo Molnar2007-07-091-1/+0
| | | | | | | | | do not set softirqs to nice +19. _If_ for whatever reason we missed to process some high-prio softirq and woke up ksoftirqd, we should give it a fair chance to actually get some work done, even if the system is under load. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: scheduler debugging, coreIngo Molnar2007-07-091-0/+275
| | | | | | | scheduler debugging core: implement /proc/sched_debug and /proc/<PID>/sched files for scheduler debugging. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: add CFS debug sysctlsIngo Molnar2007-07-091-0/+80
| | | | | | | add CFS debug sysctls: only tweakable if SCHED_DEBUG is enabled. This allows for faster debugging of scheduler problems. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove unused rq types from sched.cIngo Molnar2007-07-091-16/+0
| | | | | | | remove unused rq types from sched.c, now that we switched over to CFS. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove interactivity typesIngo Molnar2007-07-091-89/+12
| | | | | | | remove now unused interactivity-heuristics related defined and types of the old scheduler. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up include files in sched.cIngo Molnar2007-07-091-2/+2
| | | | | | clean up include files in sched.c, they were still old-style <asm/>. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: update delay-accounting to use CFS's precise statsBalbir Singh2007-07-094-9/+9
| | | | | | update delay-accounting to use CFS's precise stats. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: turn on the use of unstable eventsIngo Molnar2007-07-091-7/+14
| | | | | | make use of sched-clock-unstable events. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: x86, track TSC-unstable eventsIngo Molnar2007-07-091-0/+7
| | | | | | | | track TSC-unstable events and propagate it to the scheduler code. Also allow sched_clock() to be used when the TSC is unstable, the rq_clock() wrapper creates a reliable clock out of it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs core codeIngo Molnar2007-07-091-774/+758
| | | | | | | | | | | | | | | | apply the CFS core code. this change switches over the scheduler core to CFS's modular design and makes use of kernel/sched_fair/rt/idletask.c to implement Linux's scheduling policies. thanks to Andrew Morton and Thomas Gleixner for lots of detailed review feedback and for fixlets. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
* sched: remove the sleep-bonus interactivity codeIngo Molnar2007-07-091-46/+1
| | | | | | | | | remove the sleep-bonus interactivity code from the core scheduler. scheduling policy is implemented in the policy modules, and CFS does not need such type of heuristics. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove expired_starving()Ingo Molnar2007-07-091-22/+1
| | | | | | | | | remove the expired_starving() heuristics from the core scheduler. CFS does not need it, and this did not really work well in practice anyway, due to the rq->nr_running multiplier to STARVATION_LIMIT. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove sleep_typeIngo Molnar2007-07-091-89/+2
| | | | | | | | remove the sleep_type heuristics from the core scheduler - scheduling policy is implemented in the scheduling-policy modules. (and CFS does not use this type of sleep-type heuristics) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs, add load-calculation methodsIngo Molnar2007-07-091-18/+120
| | | | | | add the new load-calculation methods of CFS. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up __normal_prio() positionIngo Molnar2007-07-091-29/+29
| | | | | | | | clean up: move __normal_prio() in head of normal_prio(). no code changed. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cleanup: move dequeue/enqueue_task()Ingo Molnar2007-07-091-38/+38
| | | | | | | cleanup: move dequeue/enqueue_task() to a more logical place, to not split up __normal_prio()/normal_prio(). Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: move around resched_task()Ingo Molnar2007-07-091-52/+52
| | | | | | | move resched_task()/resched_cpu() into the 'public interfaces' section of sched.c, for use by kernel/sched_fair/rt/idletask.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up the rt priority macrosIngo Molnar2007-07-092-6/+18
| | | | | | clean up the rt priority macros, pointed out by Andrew Morton. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: add cfs_rq opsIngo Molnar2007-07-091-0/+12
| | | | | | | | add the set_task_cfs_rq() abstraction needed by CONFIG_FAIR_GROUP_SCHED. (not activated yet) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: make posix-cpu-timers use CFS's accounting informationIngo Molnar2007-07-092-40/+30
| | | | | | update the posix-cpu-timers code to use CFS's CPU accounting information. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: add rq_clock()/__rq_clock()Ingo Molnar2007-07-091-0/+46
| | | | | | | | add rq_clock()/__rq_clock(), a robust wrapper around sched_clock(), used by CFS. It protects against common type of sched_clock() problems (caused by hardware): time warps forwards and backwards. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs rq data typesIngo Molnar2007-07-091-6/+78
| | | | | | | | | add the CFS rq data types to sched.c. (the old scheduler fields are still intact, they are removed by a later patch) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs core, kernel/sched_idletask.cIngo Molnar2007-07-091-0/+71
| | | | | | | | | add kernel/sched_idletask.c - which implements the idle thread scheduling class. This further simplifies sched.c (under CFS), for example a number of 'if (p == rq->idle)' type of special-cases can be removed from sched.c, and schedule() gets simpler too. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs core, kernel/sched_rt.cIngo Molnar2007-07-091-0/+255
| | | | | | | add kernel/sched_rt.c: SCHED_FIFO/SCHED_RR support. The behavior and semantics of SCHED_FIFO/SCHED_RR tasks is unchanged. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cfs core, kernel/sched_fair.cIngo Molnar2007-07-091-0/+1131
| | | | | | | | | | | | | | | | | | | add kernel/sched_fair.c - which implements the bulk of CFS's behavioral changes for SCHED_OTHER tasks. see Documentation/sched-design-CFS.txt about details. Authors: Ingo Molnar <mingo@elte.hu> Dmitry Adamushko <dmitry.adamushko@gmail.com> Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
* sched: move code into kernel/sched_stats.hIngo Molnar2007-07-092-233/+236
| | | | | | | | | create sched_stats.h and move sched.c schedstats code into it. This cleans up sched.c a bit. no code changes are caused by this patch. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: add init_idle_bootup_task()Ingo Molnar2007-07-091-0/+5
| | | | | | | | add the init_idle_bootup_task() callback to the bootup thread, unused at the moment. (CFS will use it to switch the scheduling class of the boot thread to the idle class) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove sched_exit()Ingo Molnar2007-07-092-32/+0
| | | | | | | | | remove sched_exit(): the elaborate dance of us trying to recover timeslices given to child tasks never really worked. CFS does not need it either. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: uninline set_task_cpu()Ingo Molnar2007-07-091-0/+6
| | | | | | uninline set_task_cpu(): CFS will add more code to it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: zap the migration init / cache-hot balancing codeIngo Molnar2007-07-091-481/+0
| | | | | | | | | | | | | | | | | | | | | | the SMP load-balancer uses the boot-time migration-cost estimation code to attempt to improve the quality of balancing. The reason for this code is that the discrete priority queues do not preserve the order of scheduling accurately, so the load-balancer skips tasks that were running on a CPU 'recently'. this code is fundamental fragile: the boot-time migration cost detector doesnt really work on systems that had large L3 caches, it caused boot delays on large systems and the whole cache-hot concept made the balancing code pretty undeterministic as well. (and hey, i wrote most of it, so i can say it out loud that it sucks ;-) under CFS the same purpose of cache affinity can be achieved without any special cache-hot special-case: tasks are sorted in the 'timeline' tree and the SMP balancer picks tasks from the left side of the tree, thus the most cache-cold task is balanced automatically. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: rename idle_type/SCHED_IDLEIngo Molnar2007-07-091-30/+30
| | | | | | | | enum idle_type (used by the load-balancer) clashes with the SCHED_IDLE name that we want to introduce. 'CPU_IDLE' instead of 'SCHED_IDLE' is more descriptive as well. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* NTP: remove clock_was_set() call to prevent deadlockThomas Gleixner2007-07-031-2/+0
| | | | | | | | | | | | | | | | | | | | | | | The clock_was_set() call in seconds_overflow() which happens only when leap seconds are inserted / deleted is wrong in two aspects: 1. it results in a call to on_each_cpu() with interrupts disabled 2. it is potential deadlock source vs. call_lock in smp_call_function() The only possible side effect of the removal might be, that an absolute CLOCK_REALTIME timer fires 1 second too late, in the rare case of leap second deletion and an absolute CLOCK_REALTIME timer which expires in the affected time frame. It will never fire too early. This was probably observed by the reporter of a June 30th -> July 1st hang: http://lkml.org/lkml/2007/7/3/103 A similar problem was observed by Dave Jones, who provided a screen shot with a lockdep back trace, which allowed to analyse the problem. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* PM: introduce set_target method in pm_opsRafael J. Wysocki2007-07-011-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 52ade9b3b97fd3bea42842a056fe0786c28d0555 changed the suspend code ordering to execute pm_ops->prepare() after the device model per-device .suspend() calls in order to fix some ACPI-related issues. Unfortunately, it broke the at91 platform which assumed that pm_ops->prepare() would be called before suspending devices. at91 used pm_ops->prepare() to get notified of the target system sleep state, so that it could use this information while suspending devices. However, with the current suspend code ordering pm_ops->prepare() is called too late for this purpose. Thus, at91 needs an additional method in 'struct pm_ops' that will be used for notifying the platform of the target system sleep state. Moreover, in the future such a method will also be needed by ACPI. This patch adds the .set_target() method to 'struct pm_ops' and makes the suspend code call it, if implemented, before executing the device model per-device .suspend() calls. It also modifies the at91 code to use pm_ops->set_target() instead of pm_ops->prepare(). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Len Brown <lenb@kernel.org> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* relayfs: fix overwritesMasami Hiramatsu2007-06-281-2/+6
| | | | | | | | | | | When I use relayfs with "overwrite" mode, read() still sets incorrect number of consumed bytes. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Tom Zanussi <zanussi@us.ibm.com> Acked-by: David Wilder <dwilder@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* relay file read: start-pos fixDavid Wilder2007-06-281-0/+3
| | | | | | | | | | | Fix a bug in the relay read interface causing the number of consumed bytes to be set incorrectly. Signed-off-by: Tom Zanussi <zanussi@us.ibm.com> Signed-off-by: David Wilder <dwilder@us.ibm.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* FUTEX: Restore the dropped ERSCH fixThomas Gleixner2007-06-241-8/+6
| | | | | | | | | | | The return value of futex_find_get_task() needs to be -ESRCH in case that the search fails. This was part of the original futex fixes and got accidentally dropped, when the futex-tidy-up patch was split out. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Stable Team <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* audit: fix oops removing watch if audit disabledTony Jones2007-06-241-1/+1
| | | | | | | | | | | | | | | | | Removing a watched file will oops if audit is disabled (auditctl -e 0). To reproduce: - auditctl -e 1 - touch /tmp/foo - auditctl -w /tmp/foo - auditctl -e 0 - rm /tmp/foo (or mv) Signed-off-by: Tony Jones <tonyj@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sched: fix next_interval determination in idle_balance()Christoph Lameter2007-06-241-9/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | The intervals of domains that do not have SD_BALANCE_NEWIDLE must be considered for the calculation of the time of the next balance. Otherwise we may defer rebalancing forever. Siddha also spotted that the conversion of the balance interval to jiffies is missing. Fix that to. From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> also continue the loop if !(sd->flags & SD_LOAD_BALANCE). Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> It did in fact trigger under all three of mainline, CFS, and -rt including CFS -- see below for a couple of emails from last Friday giving results for these three on the AMD box (where it happened) and on a single-quad NUMA-Q system (where it did not, at least not with such severity). Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fix refcounting of nsproxy object when unsharedCedric Le Goater2007-06-241-8/+2
| | | | | | | | | | | | | When a namespace is unshared, a refcount on the previous nsproxy is abusively taken, leading to a memory leak of nsproxy objects. Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* posix-timers: Prevent softirq starvation by small intervals and SIG_IGNThomas Gleixner2007-06-221-2/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | posix-timers which deliver an ignored signal are currently rearmed in the timer softirq: This is necessary because the timer needs to be delivered again when SIG_IGN is removed. This is not a problem, when the interval is reasonable. With high resolution timers enabled one might arm a posix timer with a very small interval and ignore the signal. This might lead to a softirq starvation when the interval is so small that the timer is requeued onto the softirq pending list right away. This problem was pointed out by Jan Kiszka. Thanks Jan ! The correct solution would be to stop the timer, when the signal is ignored and rearm it when SIG_IGN is removed. Unfortunately this requires modification in sigaction and involves non trivial sighand locking. It's too late in the release cycle for such a change. For now we just keep the timer running and enforce that the timer only fires every jiffie. This does not break anything as we keep the overrun counter correct. It adds a little inaccuracy to the timer_gettime() interface, but... The more complex change is necessary anyway to fix another short coming of the current implementation, which I discovered while looking at this problem: A pending signal is discarded when SIG_IGN is set. In case that a posixtimer signal is pending then it is discarded as well, but when SIG_IGN is removed later nothing rearms the timer. This is not new, it's that way since posix timers have been merged. So nothing to worry about right now. I have a working solution to fix all of this, but the impact is too large for both stable and 2.6.22. I'm going to send it out for review in the next days. This should go into 2.6.21.stable as well. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Jan Kiszka <jan.kiszka@web.de> Cc: Ulrich Drepper <drepper@redhat.com> Cc: Stable Team <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Fix possible runqueue lock starvation in wait_task_inactive()Linus Torvalds2007-06-181-9/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Miklos Szeredi reported very long pauses (several seconds, sometimes more) on his T60 (with a Core2Duo) which he managed to track down to wait_task_inactive()'s open-coded busy-loop. He observed that an interrupt on one core tries to acquire the runqueue-lock but does not succeed in doing so for a very long time - while wait_task_inactive() on the other core loops waiting for the first core to deschedule a task (which it wont do while spinning in an interrupt handler). This rewrites wait_task_inactive() to do all its waiting optimistically without any locks taken at all, and then just double-check the end result with the proper runqueue lock held over just a very short section. If there were races in the optimistic wait, of a preemption event scheduled the process away, we simply re-synchronize, and start over. So the code now looks like this: repeat: /* Unlocked, optimistic looping! */ rq = task_rq(p); while (task_running(rq, p)) cpu_relax(); /* Get the *real* values */ rq = task_rq_lock(p, &flags); running = task_running(rq, p); array = p->array; task_rq_unlock(rq, &flags); /* Check them.. */ if (unlikely(running)) { cpu_relax(); goto repeat; } /* Preempted away? Yield if so.. */ if (unlikely(array)) { yield(); goto repeat; } Basically, that first "while()" loop is done entirely without any locking at all (and doesn't check for the case where the target process might have been preempted away), and so it's possibly "incorrect", but we don't really care. Both the runqueue used, and the "task_running()" check might be the wrong tests, but they won't oops - they just mean that we could possibly get the wrong results due to lack of locking and exit the loop early in the case of a race condition. So once we've exited the loop, we then get the proper (and careful) rq lock, and check the running/runnable state _safely_. And if it turns out that our quick-and-dirty and unsafe loop was wrong after all, we just go back and try it all again. (The patch also adds a lot of comments, which is the actual bulk of it all, to make it more obvious why we can do these things without holding the locks). Thanks to Miklos for all the testing and tracking it down. Tested-by: Miklos Szeredi <miklos@szeredi.hu> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sched: fix SysRq-N (normalize RT tasks)Ingo Molnar2007-06-181-3/+5
| | | | | | | | | | | | | | | | | | Gene Heskett reported the following problem while testing CFS: SysRq-N is not always effective in normalizing tasks back to SCHED_OTHER. The reason for that turns out to be the following bug: - normalize_rt_tasks() uses for_each_process() to iterate through all tasks in the system. The problem is, this method does not iterate through all tasks, it iterates through all thread groups. The proper mechanism to enumerate over all threads is to use a do_each_thread() + while_each_thread() loop. Reported-by: Gene Heskett <gene.heskett@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Fix signalfd interaction with thread-private signalsBenjamin Herrenschmidt2007-06-181-1/+7
| | | | | | | | | | | Don't let signalfd dequeue private signals off other threads (in the case of things like SIGILL or SIGSEGV, trying to do so would result in undefined behaviour on who actually gets the signal, since they are force unblocked). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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