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2008-03-24markers: remove ACCESS_ONCEMathieu Desnoyers1-6/+6
As Paul pointed out, the ACCESS_ONCE are not needed because we already have the explicit surrounding memory barriers. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Christoph Hellwig <hch@infradead.org> Cc: Mike Mason <mmlnx@us.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: David Smith <dsmith@redhat.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Adrian Bunk <adrian.bunk@movial.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-24markers: update preempt_disable. call_rcu, rcu_barrier commentsMathieu Desnoyers1-11/+8
Add comments requested by Andrew. Updated comments about synchronize_sched(). Since we use call_rcu and rcu_barrier now, these comments were out of sync with the code. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Christoph Hellwig <hch@infradead.org> Cc: Mike Mason <mmlnx@us.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: David Smith <dsmith@redhat.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Adrian Bunk <adrian.bunk@movial.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-24Don't 'printk()' while holding xtime lock for writingLinus Torvalds1-0/+4
The printk() can deadlock because it can wake up klogd(), and task enqueueing will try to read the time in order to set a hrtimer. Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com> Debugged-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-21sched: add arch_update_cpu_topology hook.Heiko Carstens1-0/+5
Will be called each time the scheduling domains are rebuild. Needed for architectures that don't have a static cpu topology. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-21sched: add exported arch_reinit_sched_domains() to header file.Heiko Carstens1-1/+1
Needed so it can be called from outside of sched.c. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-21sched: remove double unlikely from schedule()Roel Kluin1-1/+1
Combine two unlikely's Signed-off-by: Roel Kluin <12o3l@tiscali.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-21sched: cleanup old and rarely used 'debug' features.Peter Zijlstra2-20/+2
TREE_AVG and APPROX_AVG are initial task placement policies that have been disabled for a long while.. time to remove them. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> CC: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-21Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds1-3/+8
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (46 commits) [NET] ifb: set separate lockdep classes for queue locks [IPV6] KCONFIG: Fix description about IPV6_TUNNEL. [TCP]: Fix shrinking windows with window scaling netpoll: zap_completion_queue: adjust skb->users counter bridge: use time_before() in br_fdb_cleanup() [TG3]: Fix build warning on sparc32. MAINTAINERS: bluez-devel is subscribers-only audit: netlink socket can be auto-bound to pid other than current->pid (v2) [NET]: Fix permissions of /proc/net [SCTP]: Fix a race between module load and protosw access [NETFILTER]: ipt_recent: sanity check hit count [NETFILTER]: nf_conntrack_h323: logical-bitwise & confusion in process_setup() [RT2X00] drivers/net/wireless/rt2x00/rt2x00dev.c: remove dead code, fix warning [IPV4]: esp_output() misannotations [8021Q]: vlan_dev misannotations xfrm: ->eth_proto is __be16 [IPV4]: ipv4_is_lbcast() misannotations [SUNRPC]: net/* NULL noise [SCTP]: fix misannotated __sctp_rcv_asconf_lookup() [PKT_SCHED]: annotate cls_u32 ...
2008-03-20audit: netlink socket can be auto-bound to pid other than current->pid (v2)Pavel Emelyanov1-3/+8
From: Pavel Emelyanov <xemul@openvz.org> This patch is based on the one from Thomas. The kauditd_thread() calls the netlink_unicast() and passes the audit_pid to it. The audit_pid, in turn, is received from the user space and the tool (I've checked the audit v1.6.9) uses getpid() to pass one in the kernel. Besides, this tool doesn't bind the netlink socket to this id, but simply creates it allowing the kernel to auto-bind one. That's the preamble. The problem is that netlink_autobind() _does_not_ guarantees that the socket will be auto-bound to the current pid. Instead it uses the current pid as a hint to start looking for a free id. So, in case of conflict, the audit messages can be sent to a wrong socket. This can happen (it's unlikely, but can be) in case some task opens more than one netlink sockets and then the audit one starts - in this case the audit's pid can be busy and its socket will be bound to another id. The proposal is to introduce an audit_nlk_pid in audit subsys, that will point to the netlink socket to send packets to. It will most often be equal to audit_pid. The socket id can be got from the skb's netlink CB right in the audit_receive_msg. The audit_nlk_pid reset to 0 is not required, since all the decisions are taken based on audit_pid value only. Later, if the audit tools will bind the socket themselves, the kernel will have to provide a way to setup the audit_nlk_pid as well. A good side effect of this patch is that audit_pid can later be converted to struct pid, as it is not longer safe to use pid_t-s in the presence of pid namespaces. But audit code still uses the tgid from task_struct in the audit_signal_info and in the audit_filter_syscall. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-19revert "clocksource: make clocksource watchdog cycle through online CPUs"Andrew Morton1-10/+4
Revert commit 1ada5cba6a0318f90e45b38557e7b5206a9cba38 ("clocksource: make clocksource watchdog cycle through online CPUs") due to the regression reported by Gabriel C at http://lkml.org/lkml/2008/2/24/281 (short vesion: it makes TSC be marked as always unstable on his machine). Cc: Andi Kleen <ak@suse.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Robert Hancock <hancockr@shaw.ca> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Gabriel C <nix.or.die@googlemail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-19sched: retune wake granularityIngo Molnar1-2/+2
reduce wake-up granularity for better interactivity. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-19sched: wakeup-buddy tasks are cache-hotIngo Molnar1-0/+6
Wakeup-buddy tasks are cache-hot - this makes it a bit harder for the load-balancer to tear them apart. (but it's still possible, if the load is sufficiently assymetric) Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-19sched: improve affine wakeupsIngo Molnar3-17/+47
improve affine wakeups. Maintain the 'overlap' metric based on CFS's sum_exec_runtime - which means the amount of time a task executes after it wakes up some other task. Use the 'overlap' for the wakeup decisions: if the 'overlap' is short, it means there's strong workload coupling between this task and the woken up task. If the 'overlap' is large then the workload is decoupled and the scheduler will move them to separate CPUs more easily. ( Also slightly move the preempt_check within try_to_wake_up() - this has no effect on functionality but allows 'early wakeups' (for still-on-rq tasks) to be correctly accounted as well.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-19sched: clean up wakeup balancing, code flowIngo Molnar1-15/+10
Clean up the code flow. No code changed: kernel/sched.o: text data bss dec hex filename 42521 2858 232 45611 b22b sched.o.before 42521 2858 232 45611 b22b sched.o.after md5: 09b31c44e9aff8666f72773dc433e2df sched.o.before.asm 09b31c44e9aff8666f72773dc433e2df sched.o.after.asm Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-19sched: clean up wakeup balancing, rename variablesIngo Molnar1-12/+20
rename 'cpu' to 'prev_cpu'. No code changed: kernel/sched.o: text data bss dec hex filename 42521 2858 232 45611 b22b sched.o.before 42521 2858 232 45611 b22b sched.o.after md5: 09b31c44e9aff8666f72773dc433e2df sched.o.before.asm 09b31c44e9aff8666f72773dc433e2df sched.o.after.asm Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-19sched: clean up wakeup balancing, move wake_affine()Ingo Molnar1-59/+75
split out the affine-wakeup bits. No code changed: kernel/sched.o: text data bss dec hex filename 42521 2858 232 45611 b22b sched.o.before 42521 2858 232 45611 b22b sched.o.after md5: 9d76738f1272aa82f0b7affd2f51df6b sched.o.before.asm 09b31c44e9aff8666f72773dc433e2df sched.o.after.asm (the md5's changed because stack slots changed and some registers get scheduled by gcc in a different order - but otherwise the before and after assembly is instruction for instruction equivalent.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-17relay: fix subbuf_splice_actor() adding too many pagesJens Axboe1-2/+3
If subbuf_pages was larger than the max number of pages the pipe buffer will hold, subbuf_splice_actor() would happily go beyond the array size. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-03-15sched: simplify sched_slice()Ingo Molnar1-6/+2
Use the existing calc_delta_mine() calculation for sched_slice(). This saves a divide and simplifies the code because we share it with the other /cfs_rq->load users. It also improves code size: text data bss dec hex filename 42659 2740 144 45543 b1e7 sched.o.before 42093 2740 144 44977 afb1 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2008-03-15sched: fix fair sleepersIngo Molnar1-2/+4
Fair sleepers need to scale their latency target down by runqueue weight. Otherwise busy systems will gain ever larger sleep bonus. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2008-03-15sched: fix overload performance: buddy wakeupsPeter Zijlstra2-1/+27
Currently we schedule to the leftmost task in the runqueue. When the runtimes are very short because of some server/client ping-pong, especially in over-saturated workloads, this will cycle through all tasks trashing the cache. Reduce cache trashing by keeping dependent tasks together by running newly woken tasks first. However, by not running the leftmost task first we could starve tasks because the wakee can gain unlimited runtime. Therefore we only run the wakee if its within a small (wakeup_granularity) window of the leftmost task. This preserves fairness, but does alternate server/client task groups. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-15sched: fix calc_delta_mine()Ingo Molnar1-1/+1
lw->weight can be 0 for a short time during bootup. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2008-03-15sched: fix update_load_add()/sub()Ingo Molnar1-0/+2
Clear the cached inverse value when updating load. This is needed for calc_delta_mine() to work correctly when using the rq load. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
2008-03-15sched: min_vruntime fixPeter Zijlstra1-18/+28
Current min_vruntime tracking is incorrect and will cause serious problems when we don't run the leftmost task for some reason. min_vruntime does two things; 1) it's used to determine a forward direction when the u64 vruntime wraps, 2) it's used to track the leftmost vruntime to position newly enqueued tasks from. The current logic advances min_vruntime whenever the current task's vruntime advance. Because the current task may pass the leftmost task still waiting we're failing the second goal. This causes new tasks to be placed too far ahead and thus penalizes their runtime. Fix this by making min_vruntime the min_vruntime of the waiting tasks by tracking it in enqueue/dequeue, and compare against current's vruntime to obtain the absolute minimum when placing new tasks. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-15sched: fix race in schedule()Hiroshi Shimamoto1-22/+16
Fix a hard to trigger crash seen in the -rt kernel that also affects the vanilla scheduler. There is a race condition between schedule() and some dequeue/enqueue functions; rt_mutex_setprio(), __setscheduler() and sched_move_task(). When scheduling to idle, idle_balance() is called to pull tasks from other busy processor. It might drop the rq lock. It means that those 3 functions encounter on_rq=0 and running=1. The current task should be put when running. Here is a possible scenario: CPU0 CPU1 | schedule() | ->deactivate_task() | ->idle_balance() | -->load_balance_newidle() rt_mutex_setprio() | | --->double_lock_balance() *get lock *rel lock * on_rq=0, ruuning=1 | * sched_class is changed | *rel lock *get lock : | : ->put_prev_task_rt() ->pick_next_task_fair() => panic The current process of CPU1(P1) is scheduling. Deactivated P1, and the scheduler looks for another process on other CPU's runqueue because CPU1 will be idle. idle_balance(), load_balance_newidle() and double_lock_balance() are called and double_lock_balance() could drop the rq lock. On the other hand, CPU0 is trying to boost the priority of P1. The result of boosting only P1's prio and sched_class are changed to RT. The sched entities of P1 and P1's group are never put. It makes cfs_rq invalid, because the cfs_rq has curr and no leaf, but pick_next_task_fair() is called, then the kernel panics. Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-13Merge branches 'release' and 'doc' into releaseLen Brown1-1/+1
2008-03-12documentation: Move power-related files to Documentation/power/Randy Dunlap1-1/+1
Move 00-INDEX entries to power/00-INDEX (and add entry for pm_qos_interface.txt). Update references to moved filenames. Fix some trailing whitespace. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Len Brown <len.brown@intel.com>
2008-03-11Hibernation: Fix mark_nosave_pages()Rafael J. Wysocki1-7/+34
There is a problem in the hibernation code that triggers on some NUMA systems on which pfn_valid() returns 'true' for some PFNs that don't belong to any zone. Namely, there is a BUG_ON() in memory_bm_find_bit() that triggers for PFNs not belonging to any zone and passing the pfn_valid() test. On the affected systems it triggers when we mark PFNs reported by the platform as not saveable, because the PFNs in question belong to a region mapped directly using iorepam() (i.e. the ACPI data area) and they pass the pfn_valid() test. Modify memory_bm_find_bit() so that it returns an error if given PFN doesn't belong to any zone instead of crashing the kernel and ignore the result returned by it in mark_nosave_pages(), while marking the "nosave" memory regions. This doesn't affect the hibernation functionality, as we won't touch the PFNs in question anyway. http://bugzilla.kernel.org/show_bug.cgi?id=9966 . Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
2008-03-11keep rd->online and cpu_online_map in syncGregory Haskins1-1/+2
It is possible to allow the root-domain cache of online cpus to become out of sync with the global cpu_online_map. This is because we currently trigger removal of cpus too early in the notifier chain. Other DOWN_PREPARE handlers may in fact run and reconfigure the root-domain topology, thereby stomping on our own offline handling. The end result is that rd->online may become out of sync with cpu_online_map, which results in potential task misrouting. So change the offline handling to be more tightly coupled with the global offline process by triggering on CPU_DYING intead of CPU_DOWN_PREPARE. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-11Revert "cpu hotplug: adjust root-domain->online span in response to hotplug ↵Gregory Haskins1-7/+11
event" This reverts commit 393d94d98b19089ec172566e23557997931b137e. Lets fix this right. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-10rcu: move PREEMPT_RCU config option back under PREEMPTPaul E. McKenney1-0/+15
The original preemptible-RCU patch put the choice between classic and preemptible RCU into kernel/Kconfig.preempt, which resulted in build failures on machines not supporting CONFIG_PREEMPT. This choice was therefore moved to init/Kconfig, which worked, but placed the choice between classic and preemptible RCU at the top level, a very obtuse choice indeed. This patch changes from the Kconfig "choice" mechanism to a pair of booleans, only one of which (CONFIG_PREEMPT_RCU) is user-visible, and is located in kernel/Kconfig.preempt, where one would expect it to be. The other (CONFIG_CLASSIC_RCU) is in init/Kconfig so that it is available to all architectures, hopefully avoiding build breakage. Thanks to Roman Zippel for suggesting this approach. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: Josh Triplett <josh@freedesktop.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-10modules: warn about suspicious return values from module's ->init() hookAlexey Dobriyan1-0/+8
Return value convention of module's init functions is 0/-E. Sometimes, e.g. during forward-porting mistakes happen and buggy module created, where result of comparison "workqueue != NULL" is propagated all the way up to sys_init_module. What happens is that some other module created workqueue in question, our module created it again and module was successfully loaded. Or it could be some other bug. Let's make such mistakes much more visible. In retrospective, such messages would noticeably shorten some of my head-scratching sessions. Note, that dump_stack() is just a way to get attention from user. Sample message: sys_init_module: 'foo'->init suspiciously returned 1, it should follow 0/-E convention sys_init_module: loading module anyway... Pid: 4223, comm: modprobe Not tainted 2.6.24-25f666300625d894ebe04bac2b4b3aadb907c861 #5 Call Trace: [<ffffffff80254b05>] sys_init_module+0xe5/0x1d0 [<ffffffff8020b39b>] system_call_after_swapgs+0x7b/0x80 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-10modules: fix module waiting for dependent modules' initRusty Russell1-3/+4
Commit c9a3ba55 (module: wait for dependent modules doing init.) didn't quite work because the waiter holds the module lock, meaning that the state of the module it's waiting for cannot change. Fortunately, it's fairly simple to update the state outside the lock and do the wakeup. Thanks to Jan Glauber for tracking this down and testing (qdio and qeth). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-09Merge git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrtLinus Torvalds3-11/+20
* git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt: time: remove obsolete CLOCK_TICK_ADJUST time: don't touch an offlined CPU's ts->tick_stopped in tick_cancel_sched_timer() time: prevent the loop in timespec_add_ns() from being optimised away ntp: use unsigned input for do_div()
2008-03-09cpu hotplug: adjust root-domain->online span in response to hotplug eventGregory Haskins1-11/+7
We currently set the root-domain online span automatically when the domain is added to the cpu if the cpu is already a member of cpu_online_map. This was done as a hack/bug-fix for s2ram, but it also causes a problem with hotplug CPU_DOWN transitioning. The right way to fix the original problem is to actually respond to CPU_UP events, instead of CPU_ONLINE, which is already too late. This solves the hung reboot regression reported by Andrew Morton and others. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-09time: remove obsolete CLOCK_TICK_ADJUSTRoman Zippel2-5/+12
The first version of the ntp_interval/tick_length inconsistent usage patch was recently merged as bbe4d18ac2e058c56adb0cd71f49d9ed3216a405 http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bbe4d18ac2e058c56adb0cd71f49d9ed3216a405 While the fix did greatly improve the situation, it was correctly pointed out by Roman that it does have a small bug: If the users change clocksources after the system has been running and NTP has made corrections, the correctoins made against the old clocksource will be applied against the new clocksource, causing error. The second attempt, which corrects the issue in the NTP_INTERVAL_LENGTH definition has also made it up-stream as commit e13a2e61dd5152f5499d2003470acf9c838eab84 http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e13a2e61dd5152f5499d2003470acf9c838eab84 Roman has correctly pointed out that CLOCK_TICK_ADJUST is calculated based on the PIT's frequency, and isn't really relevant to non-PIT driven clocksources (that is, clocksources other then jiffies and pit). This patch reverts both of those changes, and simply removes CLOCK_TICK_ADJUST. This does remove the granularity error correction for users of PIT and Jiffies clocksource users, but the granularity error but for the majority of users, it should be within the 500ppm range NTP can accommodate for. For systems that have granularity errors greater then 500ppm, the "ntp_tick_adj=" boot option can be used to compensate. [johnstul@us.ibm.com: provided changelog] [mattilinnanvuori@yahoo.com: maek ntp_tick_adj static] Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Acked-by: john stultz <johnstul@us.ibm.com> Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-09time: don't touch an offlined CPU's ts->tick_stopped in ↵Karsten Wiese1-1/+1
tick_cancel_sched_timer() Silences WARN_ONs in rcu_enter_nohz() and rcu_exit_nohz(), which appeared before caused by (repeated) calls to: $ echo 0 > /sys/devices/system/cpu/cpu1/online $ echo 1 > /sys/devices/system/cpu/cpu1/online Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de> Cc: johnstul@us.ibm.com Cc: Rafael Wysocki <rjw@sisk.pl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-09ntp: use unsigned input for do_div()David Howells1-5/+7
The kernel NTP code shouldn't hand 64-bit *signed* values to do_div(). Make it instead hand 64-bit unsigned values. This gets rid of a couple of warnings. Signed-off-by: David Howells <dhowells@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-08Fix waitid si_code regressionRoland McGrath1-1/+1
In commit ee7c82da830ea860b1f9274f1f0cdf99f206e7c2 ("wait_task_stopped: simplify and fix races with SIGCONT/SIGKILL/untrace"), the magic (short) cast when storing si_code was lost in wait_task_stopped. This leaks the in-kernel CLD_* values that do not match what userland expects. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-07sched: don't allow rt_runtime_us to be zero for groups having rt tasksDhaval Giani1-0/+17
This patch checks if we can set the rt_runtime_us to 0. If there is a realtime task in the group, we don't want to set the rt_runtime_us as 0 or bad things will happen. (that task wont get any CPU time despite being TASK_RUNNNG) Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07sched: rt-group: fixup schedulability constraints calculationPeter Zijlstra1-7/+3
it was only possible to configure the rt-group scheduling parameters beyond the default value in a very small range. that's because div64_64() has a different calling convention than do_div() :/ fix a few untidies while we are here; sysctl_sched_rt_period may overflow due to that multiplication, so cast to u64 first. Also that RUNTIME_INF juggling makes little sense although its an effective NOP. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07sched: fix the wrong time slice value for SCHED_FIFO tasksMiao Xie1-1/+1
Function sys_sched_rr_get_interval returns wrong time slice value for SCHED_FIFO tasks. The time slice for SCHED_FIFO tasks should be 0. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07sched: export task_nicePavel Roskin1-1/+1
The API is trivial, and so is the implementation. Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07sched: balance RT task resched only on runqueueSteven Rostedt1-2/+4
Sripathi Kodi reported a crash in the -rt kernel: https://bugzilla.redhat.com/show_bug.cgi?id=435674 this is due to a place that can reschedule a task without holding the tasks runqueue lock. This was caused by the RT balancing code that pulls RT tasks to the current run queue and will reschedule the current task. There's a slight chance that the pulling of the RT tasks will release the current runqueue's lock and retake it (in the double_lock_balance). During this time that the runqueue is released, the current task can migrate to another runqueue. In the prio_changed_rt code, after the pull, if the current task is of lesser priority than one of the RT tasks pulled, resched_task is called on the current task. If the current task had migrated in that small window, resched_task will be called without holding the runqueue lock for the runqueue that the task is on. This race condition also exists in the mainline kernel and this patch adds a check to make sure the task hasn't migrated before calling resched_task. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Tested-by: Sripathi Kodi <sripathik@in.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-07sched: retain vruntimePeter Zijlstra2-0/+19
Kei Tokunaga reported an interactivity problem when moving tasks between control groups. Tasks would retain their old vruntime when moved between groups, this can cause funny lags. Re-set the vruntime on group move to fit within the new tree. Reported-by: Kei Tokunaga <tokunaga.keiich@jp.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-05cpusets: fix obsolete commentDavid Rientjes1-2/+2
mm migration is no longer done in cpuset_update_task_memory_state() so it can no longer take current->mm->mmap_sem, so fix the obsolete comment. [ This changed in commit 04c19fa6f16047abff2288ddbc1f0798ede5a849 ("cpuset: migrate all tasks in cpuset at once") when the mm migration was moved from cpuset_update_task_memory_state() to update_nodemask() ] Signed-off-by: David Rientjes <rientjes@google.com> Cc: Paul Jackson <pj@sgi.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04module: allow ndiswrapper to use GPL-only symbolsPavel Roskin1-1/+8
A change after 2.6.24 broke ndiswrapper by accidentally removing its access to GPL-only symbols. Revert that change and add comments about the reasons why ndiswrapper and driverloader are treated in a special way. Signed-off-by: Pavel Roskin <proski@gnu.org> Acked-by: Greg KH <gregkh@suse.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jon Masters <jonathan@jonmasters.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04kprobes: fix a null pointer bug in register_kretprobe()Masami Hiramatsu1-17/+26
Fix a bug in regiseter_kretprobe() which does not check rp->kp.symbol_name == NULL before calling kprobe_lookup_name. For maintainability, this introduces kprobe_addr helper function which resolves addr field. It is used by register_kprobe and register_kretprobe. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04markers: don't risk NULL deref in markerJesper Juhl1-4/+5
get_marker() may return NULL, so test for it. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04Kprobes: indicate kretprobe support in KconfigAnanth N Mavinakayanahalli1-6/+3
Add CONFIG_HAVE_KRETPROBES to the arch/<arch>/Kconfig file for relevant architectures with kprobes support. This facilitates easy handling of in-kernel modules (like samples/kprobes/kretprobe_example.c) that depend on kretprobes being present in the kernel. Thanks to Sam Ravnborg for helping make the patch more lean. Per Mathieu's suggestion, added CONFIG_KRETPROBES and fixed up dependencies. Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04Memory Resource Controller use strstrip while parsing argumentsBalbir Singh1-0/+1
The memory controller has a requirement that while writing values, we need to use echo -n. This patch fixes the problem and makes the UI more consistent. Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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