aboutsummaryrefslogtreecommitdiffstats
path: root/kernel
Commit message (Collapse)AuthorAge
* Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds2011-03-16
|\ | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: smp: Document transitivity for memory barriers. rcu: add comment saying why DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT. rcupdate: remove dead code rcu: add documentation saying which RCU flavor to choose rcutorture: Get rid of duplicate sched.h include rcu: call __rcu_read_unlock() in exit_rcu for tiny RCU
| * rcu: add comment saying why DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT.Paul E. McKenney2011-03-04
| | | | | | | | | | | | | | | | The build will break if you change the Kconfig to allow DEBUG_OBJECTS_RCU_HEAD and !PREEMPT, so document the reasoning near where the breakage would occur. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| * rcupdate: remove dead codeAmerigo Wang2011-03-04
| | | | | | | | | | | | | | | | | | DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT, so #ifndef CONFIG_PREEMPT is totally useless in kernel/rcupdate.c. Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| * rcutorture: Get rid of duplicate sched.h includeJesper Juhl2011-03-04
| | | | | | | | | | | | | | | | linux/sched.h is included twice in kernel/rcutorture.c - once is enough. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
| * rcu: call __rcu_read_unlock() in exit_rcu for tiny RCULai Jiangshan2011-03-04
| | | | | | | | | | | | | | | | Using __rcu_read_lock() in place of rcu_read_lock() leaves any debug state as it really should be, namely with the lock still held. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* | Merge branch 'irq-core-for-linus' of ↵Linus Torvalds2011-03-15
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (116 commits) x86: Enable forced interrupt threading support x86: Mark low level interrupts IRQF_NO_THREAD x86: Use generic show_interrupts x86: ioapic: Avoid redundant lookup of irq_cfg x86: ioapic: Use new move_irq functions x86: Use the proper accessors in fixup_irqs() x86: ioapic: Use irq_data->state x86: ioapic: Simplify irq chip and handler setup x86: Cleanup the genirq name space genirq: Add chip flag to force mask on suspend genirq: Add desc->irq_data accessor genirq: Add comments to Kconfig switches genirq: Fixup fasteoi handler for oneshot mode genirq: Provide forced interrupt threading sched: Switch wait_task_inactive to schedule_hrtimeout() genirq: Add IRQF_NO_THREAD genirq: Allow shared oneshot interrupts genirq: Prepare the handling of shared oneshot interrupts genirq: Make warning in handle_percpu_event useful x86: ioapic: Move trigger defines to io_apic.h ... Fix up trivial(?) conflicts in arch/x86/pci/xen.c due to genirq name space changes clashing with the Xen cleanups. The set_irq_msi() had moved to xen_bind_pirq_msi_to_irq().
| * | genirq: Add chip flag to force mask on suspendThomas Gleixner2011-03-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On suspend we disable all interrupts in the core code, but this does not mask the interrupt line in the default implementation as we use a lazy disable approach. That means we mark the interrupt disabled, but leave the hardware unmasked. That's an optimization because we avoid the hardware access for the common case where no interrupt happens after we marked it disabled. If an interrupt happens, then the interrupt flow handler masks the line at the hardware level and marks it pending. Suspend makes use of this delayed disable as it "disables" all interrupts when preparing the suspend transition. Right before the system goes into hardware suspend state it checks whether one of the interrupts which is marked as a wakeup interrupt came in after disabling it. Most interrupt chips have a separate register which selects the interrupts which can wake up the system from suspend, so we don't have to mask any on the non wakeup interrupts. But now we have to deal with brilliant designed hardware which lacks such a wakeup configuration facility. For such hardware it's necessary to mask all non wakeup interrupts before going into suspend in order to avoid the wakeup from random interrupts. Rather than working around this in the affected interrupt chip implementations we can solve this elegant in the core code itself. Add a flag IRQCHIP_MASK_ON_SUSPEND which can be set by the irq chip implementation to indicate, that the interrupts which are not selected as wakeup sources must be masked in the suspend path. Mask them in the loop which checks the wakeup interrupts pending flag. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org> LKML-Reference: <alpine.LFD.2.00.1103112112310.2787@localhost6.localdomain6>
| * | genirq: Add comments to Kconfig switchesThomas Gleixner2011-03-08
| | | | | | | | | | | | | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Sam Ravnborg <sam@ravnborg.org>
| * | genirq: Fixup fasteoi handler for oneshot modeThomas Gleixner2011-03-02
| | | | | | | | | | | | | | | | | | | | | The fasteoi handler must mask the interrupt line in oneshot mode otherwise we end up with an irq storm. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Provide forced interrupt threadingThomas Gleixner2011-02-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a commandline parameter "threadirqs" which forces all interrupts except those marked IRQF_NO_THREAD to run threaded. That's mostly a debug option to allow retrieving better debug data from crashing interrupt handlers. If "threadirqs" is not enabled on the kernel command line, then there is no impact in the interrupt hotpath. Architecture code needs to select CONFIG_IRQ_FORCED_THREADING after marking the interrupts which cant be threaded IRQF_NO_THREAD. All interrupts which have IRQF_TIMER set are implict marked IRQF_NO_THREAD. Also all PER_CPU interrupts are excluded. Forced threading hard interrupts also forces all soft interrupt handling into thread context. When enabled it might slow down things a bit, but for debugging problems in interrupt code it's a reasonable penalty as it does not immediately crash and burn the machine when an interrupt handler is buggy. Some test results on a Core2Duo machine: Cache cold run of: # time git grep irq_desc non-threaded threaded real 1m18.741s 1m19.061s user 0m1.874s 0m1.757s sys 0m5.843s 0m5.427s # iperf -c server non-threaded [ 3] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec threaded [ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec [ 3] 0.0-10.0 sec 1.09 GBytes 937 Mbits/sec Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.772668648@linutronix.de>
| * | sched: Switch wait_task_inactive to schedule_hrtimeout()Thomas Gleixner2011-02-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we force thread hard and soft interrupts the startup of ksoftirqd would hang in kthread_bind() when wait_task_inactive() calls schedule_timeout_uninterruptible() because there is no softirq yet which will wake us up. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.677109139@linutronix.de>
| * | genirq: Allow shared oneshot interruptsThomas Gleixner2011-02-25
| | | | | | | | | | | | | | | | | | | | | | | | Support ONESHOT on shared interrupts, if all drivers agree on it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.483640430@linutronix.de>
| * | genirq: Prepare the handling of shared oneshot interruptsThomas Gleixner2011-02-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For level type interrupts we need to track how many threads are on flight to avoid useless interrupt storms when not all thread handlers have finished yet. Keep track of the woken threads and only unmask when there are no more threads in flight. Yes, I'm lazy and using a bitfield. But not only because I'm lazy, the main reason is that it's way simpler than using a refcount. A refcount based solution would need to keep track of various things like crashing the irq thread, spurious interrupts coming in, disables/enables, free_irq() and some more. The bitfield keeps the tracking simple and makes things just work. It's also nicely confined to the thread code pathes and does not require additional checks all over the place. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.388095876@linutronix.de>
| * | genirq: Make warning in handle_percpu_event usefulThomas Gleixner2011-02-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The WARN_ON_ONCE in handle_percpu_event() which emits a warning when an action handler returns with interrupts enabled is not really useful. It does not reveal the interrupt number and handler function which caused it. Make it WARN_ONCE() and add the information. Reported-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Streamline kernel/irq/KconfigJan Beulich2011-02-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | "def_bool n" without prompt is pointless, these should be just "bool". [ tglx: Adapted to latest changes ] Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <4D5D3309020000780003264A@vpn.id2.novell.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Use the correct variable for note_interruptThomas Gleixner2011-02-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | note_interrupt wants to be called with the combined result of all handlers called, not with the last one. If it's a shared interrupt then the last handler might return IRQ_NONE often enough to trigger the spurious dectector which turns off a perfectly fine working interrupt line. Bug was introduced in commit 1277a532(genirq: Simplify handle_irq_event()). Yes, I really messed up there. First the variable ret should not have been named differently to avoid similarity with retval. Second it should have been declared in the do {} loop. Rename it to res and move it into the do {} loop and vanish under a huge brown paperbag. Reported-bisected-tested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Add missing break in __irq_set_trigger()Thomas Gleixner2011-02-21
| | | | | | | | | | | | | | | | | | | | | | | | The switch case in __irq_set_trigger() lacks a break, which emits a pr_err unconditionally on success. Reported-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Use IRQ_BITMAP_BITS as search size in irq_alloc_descs()Yinghai Lu2011-02-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The runtime expansion of nr_irqs does not take into account that bitmap_find_next_zero_area() returns "start" + size in case the search for an matching zero area fails. That results in a start value which can be completely off and is not covered by the following expand_nr_irqs() and possibly outside of the absolute limit. But we use it without further checking. Use IRQ_BITMAP_BITS as the limit for the bitmap search and expand nr_irqs when the start bit is beyond nr_irqs. So start is always pointing to the correct area in the bitmap. nr_irqs is just the limit for irq enumerations, not the real limit for the irq space. [ tglx: Let irq_expand_nr_irqs() take the new upper end so we do not expand nr_irqs more than necessary. Made changelog readable ] Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <4D6014F9.8040605@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Fix misplaced status update in irq_disable()Thomas Gleixner2011-02-21
| | | | | | | | | | | | | | | | | | | | | We lazy disable interrupt lines, so only mark the line masked, when the chip provides an irq_disable callback. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Implement irq_data based move_*_irq() versionsThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | No need to lookup the irq descriptor when calling from a chip callback function which has irq_data already handy. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq; Add fasteoi irq_chip quirkThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | Some chips want irq_eoi() only called when an interrupt is actually handled. So they have checks for INPROGRESS and DISABLED in their irq_eoi callbacks. Add a chip flag, which allows to handle that in the generic code. No impact on the fastpath. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Add preflow handler supportThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | sparc64 needs to call a preflow handler on certain interrupts befor calling the action chain. Integrate it into handle_fasteoi_irq. Must be enabled via CONFIG_IRQ_FASTEOI_PREFLOW. No impact when disabled. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: David S. Miller <davem@davemloft.net>
| * | genirq: Consolidate set_chip_handler functionsThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No need to have separate functions if we have one plus inline wrappers. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Use irq_get/put functionsThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | Convert the management functions to use the common irq_get/put function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Implement irq_get/put_desc_[bus]locked/unlock()Thomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | Most of the managing functions get the irq descriptor and lock it - either with or without buslock. Instead of open coding this over and over provide a common function to do that. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Remove real old transition functionsThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | These transition helpers are stale for years now. Remove them. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Remove desc->status when GENERIC_HARDIRQS_NO_COMPAT=yThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If everything uses the right accessors, then enabling GENERIC_HARDIRQS_NO_COMPAT should just work. If not it will tell you. Don't be lazy and use the trick which I use in the core code! git grep status_use_accessors will unearth it in a split second. Offenders are tracked down and not slapped with stinking trouts. This time we use frozen shark for a better educational value. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Reflect IRQ_MOVE_PCNTXT in irq_data stateThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Required by x86. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move wakeup state to irq_dataThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | Some irq_chips need to know the state of wakeup mode for setting the trigger type etc. Reflect it in irq_data state. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Add IRQCHIP_SET_TYPE_MASKED flagThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | irq_chips, which require to mask the chip before changing the trigger type should set this flag. So the core takes care of it and the requirement for looking into desc->status in the chip goes away. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Lars-Peter Clausen <lars@metafoo.de>
| * | genirq: Cleanup irq.hThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Put the constants into an enum and document them. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Force wrapped access to desc->status in core codeThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Force the usage of wrappers by another nasty CPP substitution. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Wrap the remaning IRQ_* flagsThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Use wrappers to keep them away from the core code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Mirror irq trigger type bits in irq_data.stateThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | That's the data structure chip functions get provided. Also allow them to signal the core code that they updated the flags in irq_data.state by returning IRQ_SET_MASK_OK_NOCOPY. The default is unchanged. The type bits should be accessed via: val = irqd_get_trigger_type(irqdata); and irqd_set_trigger_type(irqdata, val); Coders who access them directly will be tracked down and slapped with stinking trouts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_AFFINITY_SET to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Keep status in sync until last abuser is gone. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Reuse existing can set affinty checkThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Add a !desc check while at it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Mirror IRQ_PER_CPU and IRQ_NO_BALANCING in irq_data.stateThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | That's the right data structure to look at for arch code. Accessor functions are provided. irqd_is_per_cpu(irqdata); irqd_can_balance(irqdata); Coders who access them directly will be tracked down and slapped with stinking trouts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move debug code to separate headerThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | It'll break when I'm going to undefine the constants. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Remove CHECK_IRQ_PER_CPU from core codeThomas Gleixner2011-02-19
| | | | | | | | | | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Remove CONFIG_IRQ_PER_CPUThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | The saving of this switch is minimal versus the ifdef mess it creates. Simple enable PER_CPU unconditionally and remove the config switch. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Add IRQ_MOVE_PENDING to irq_data.stateThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | chip implementations need to know about it. Keep status in sync until all users are fixed. Accessor function: irqd_is_setaffinity_pending(irqdata) Coders who access them directly will be tracked down and slapped with stinking trouts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_WAKEUP to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No users outside of core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_SUSPENDED to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No users outside of core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_MASKED to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Keep status in sync until all users are fixed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_PENDING flag to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Keep status in sync until all users are fixed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_DISABLED to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | Keep status in sync until all abusers are fixed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_REPLAY and IRQ_WAITING to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No users outside of core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_ONESHOT to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No users outside of core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Add IRQ_INPROGRESS to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to maintain the flag for now in both fields status and istate. Add a CONFIG_GENERIC_HARDIRQS_NO_COMPAT switch to allow testing w/o the status one. Wrap the access to status IRQ_INPROGRESS in a inline which can be turned of with CONFIG_GENERIC_HARDIRQS_NO_COMPAT along with the define. There is no reason that anything outside of core looks at this. That needs some modifications, but we'll get there. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | genirq: Move IRQ_POLL_INPROGRESS to coreThomas Gleixner2011-02-19
| | | | | | | | | | | | | | | | | | No users outside of core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-17 16:06:40 -0500