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* Merge branch 'linus' into irq/threadedIngo Molnar2009-04-05
|\ | | | | | | | | | | Conflicts: include/linux/irq.h kernel/irq/handle.c
| * PM: Introduce functions for suspending and resuming device interruptsRafael J. Wysocki2009-03-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce helper functions allowing us to prevent device drivers from getting any interrupts (without disabling interrupts on the CPU) during suspend (or hibernation) and to make them start to receive interrupts again during the subsequent resume. These functions make it possible to keep timer interrupts enabled while the "late" suspend and "early" resume callbacks provided by device drivers are being executed. In turn, this allows device drivers' "late" suspend and "early" resume callbacks to sleep, execute ACPI callbacks etc. The functions introduced here will be used to rework the handling of interrupts during suspend (hibernation) and resume. Namely, interrupts will only be disabled on the CPU right before suspending sysdevs, while device drivers will be prevented from receiving interrupts, with the help of the new helper function, before their "late" suspend callbacks run (and analogously during resume). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Ingo Molnar <mingo@elte.hu>
| * Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2Ingo Molnar2009-03-27
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/parisc/kernel/irq.c arch/x86/include/asm/fixmap_64.h arch/x86/include/asm/setup.h kernel/irq/handle.c Semantic merge: arch/x86/include/asm/fixmap.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * Merge branch 'linus' into core/percpuIngo Molnar2009-01-30
| | |\ | | | | | | | | | | | | | | | | Conflicts: kernel/irq/handle.c
* | | | genirq: threaded irq handlers review fixupsThomas Gleixner2009-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Delta patch to address the review comments. - Implement warning when IRQ_WAKE_THREAD is requested and no thread handler installed - coding style fixes Pointed-out-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | | | genirq: add threaded interrupt handler supportThomas Gleixner2009-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for threaded interrupt handlers: A device driver can request that its main interrupt handler runs in a thread. To achive this the device driver requests the interrupt with request_threaded_irq() and provides additionally to the handler a thread function. The handler function is called in hard interrupt context and needs to check whether the interrupt originated from the device. If the interrupt originated from the device then the handler can either return IRQ_HANDLED or IRQ_WAKE_THREAD. IRQ_HANDLED is returned when no further action is required. IRQ_WAKE_THREAD causes the genirq code to invoke the threaded (main) handler. When IRQ_WAKE_THREAD is returned handler must have disabled the interrupt on the device level. This is mandatory for shared interrupt handlers, but we need to do it as well for obscure x86 hardware where disabling an interrupt on the IO_APIC level redirects the interrupt to the legacy PIC interrupt lines. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@elte.hu>
* | | | Merge branch 'cpus4096' into irq/threadedThomas Gleixner2009-03-23
|\ \ \ \ | |/ / / |/| | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/parisc/kernel/irq.c kernel/irq/handle.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | | Merge branch 'core/percpu' into x86/coreIngo Molnar2009-01-28
| |\| | | | |/ | |/| | | | | | | Conflicts: kernel/irq/handle.c
| | * cpumask: update irq_desc to use cpumask_var_tMike Travis2009-01-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: reduce memory usage, use new cpumask API. Replace the affinity and pending_masks with cpumask_var_t's. This adds to the significant size reduction done with the SPARSE_IRQS changes. The added functions (init_alloc_desc_masks & init_copy_desc_masks) are in the include file so they can be inlined (and optimized out for the !CONFIG_CPUMASKS_OFFSTACK case.) [Naming chosen to be consistent with the other init*irq functions, as well as the backwards arg declaration of "from, to" instead of the more common "to, from" standard.] Includes a slight change to the declaration of struct irq_desc to embed the pending_mask within ifdef(CONFIG_SMP) to be consistent with other references, and some small changes to Xen. Tested: sparse/non-sparse/cpumask_offstack/non-cpumask_offstack/nonuma/nosmp on x86_64 Signed-off-by: Mike Travis <travis@sgi.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: virtualization@lists.osdl.org Cc: xen-devel@lists.xensource.com Cc: Yinghai Lu <yhlu.kernel@gmail.com>
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*-. | | Merge branches 'irq/genirq' and 'linus' into irq/coreIngo Molnar2009-03-16
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| * | | genirq: use kzalloc instead of explicit zero initializationThomas Gleixner2009-03-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: simplification Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Peter Zijlstra <peterz@infradead.org>
| * | | genirq: remove redundant if conditionThomas Gleixner2009-03-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: cleanup The code is only compiled if CONFIG_GENERIC_HARDIRQS=y so another check for this define in the code is redundant. Remove it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | | irq: export remove_irq() and setup_irq() symbolsMagnus Damm2009-03-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Export the setup_irq() and remove_irq() symbols. I'd like to export these functions since I have timer code that needs to use setup_irq() early on (too early for request_irq()), and the same code can also be compiled as a module. Signed-off-by: Magnus Damm <damm@igel.co.jp> LKML-Reference: <20090312120559.2926.82371.sendpatchset@rx1.opensource.se> [ changed to _GPL as these are special APIs deep inside the irq layer. ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | irq: match remove_irq() args with setup_irq()Magnus Damm2009-03-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Modify remove_irq() to match setup_irq(). Signed-off-by: Magnus Damm <damm@igel.co.jp> LKML-Reference: <20090312120551.2926.43942.sendpatchset@rx1.opensource.se> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | irq: add remove_irq() for freeing of setup_irq() irqsMagnus Damm2009-03-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: add new API This patch adds a remove_irq() function for releasing interrupts requested with setup_irq(). Without this patch we have no way of releasing such interrupts since free_irq() today tries to kfree() the irqaction passed with setup_irq(). Signed-off-by: Magnus Damm <damm@igel.co.jp> LKML-Reference: <20090312120542.2926.56609.sendpatchset@rx1.opensource.se> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | Merge branch 'linus' into irq/genirqIngo Molnar2009-03-02
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| * | | irq: name 'p' variables a bit betterIngo Molnar2009-02-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'p' stands for pointer - make it clear in setup_irq() and free_irq() what kind of pointer it is. Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | irq: further clean up the free_irq() code flowIngo Molnar2009-02-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linus noticed that the 'pp' variable can be eliminated altogether, and the loop can be cleaned up further. Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | irq: refactor and clean up the free_irq() code flowIngo Molnar2009-02-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: cleanup - separate out the loop from the actual freeing logic, this wins us two indentation levels allowing a number of followup prettifications - turn the WARN_ON() into a more informative WARN(). - clean up the comments and the code flow some more Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | irq: clean up manage.cIngo Molnar2009-02-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - make printk message git-greppable - fix a few style details Signed-off-by: Ingo Molnar <mingo@elte.hu>
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*---. \ \ \ Merge branches 'irq/genirq', 'irq/sparseirq' and 'irq/urgent' into irq/coreIngo Molnar2009-02-13
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| | | * kernel/irq: fix sparse warning: make symbol staticHannes Eder2009-02-09
| |_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While being at it make every occurrence of 'do_irq_select_affinity' have the same signature in terms of signedness of the first argument. Fix this sparse warning: kernel/irq/manage.c:112:5: warning: symbol 'do_irq_select_affinity' was not declared. Should it be static? Also rename do_irq_select_affinity() to setup_affinity() - shorter name and clearer naming. Signed-off-by: Hannes Eder <hannes@hanneseder.net> Acked-by: Matthew Wilcox <matthew@wil.cx> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | irq: use GFP_KERNEL for action allocation in request_irq()Johannes Weiner2009-02-13
| |/ | | | | | | | | | | | | | | | | request_irq() calls into proc code via __setup_irq() which is not safe in an atomic context, so request_irq() can itself use the more reliable GFP_KERNEL allocation for the action descriptor. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | cpumask fallout: Initialize irq_default_affinity earlierDavid Daney2009-01-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Move the initialization of irq_default_affinity to early_irq_init as core_initcall is too late. irq_default_affinity can be used in init_IRQ and potentially timer and SMP init as well. All of these happen before core_initcall. Moving the initialization to early_irq_init ensures that it is initialized before it is used. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Acked-by: Mike Travis <travis@sgi.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Make irq_*_affinity depend on CONFIG_GENERIC_HARDIRQS too.David Daney2009-01-27
|/ | | | | | | | | In interrupt.h these functions are declared only if CONFIG_GENERIC_HARDIRQS is set. We should define them under identical conditions. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* cpumask: convert kernel/irqRusty Russell2008-12-31
| | | | | | | | | Impact: Reduce stack usage, use new cpumask API. ALPHA mod! Main change is that irq_default_affinity becomes a cpumask_var_t, so treat it as a pointer (this effects alpha). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Merge branch 'master' of ↵Rusty Russell2008-12-31
|\ | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: arch/x86/kernel/io_apic.c
| * Merge branch 'irq-core-for-linus' of ↵Linus Torvalds2008-12-30
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: x86, sparseirq: clean up Kconfig entry x86: turn CONFIG_SPARSE_IRQ off by default sparseirq: fix numa_migrate_irq_desc dependency and comments sparseirq: add kernel-doc notation for new member in irq_desc, -v2 locking, irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP sparseirq, xen: make sure irq_desc is allocated for interrupts sparseirq: fix !SMP building, #2 x86, sparseirq: move irq_desc according to smp_affinity, v7 proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQ sparse irqs: add irqnr.h to the user headers list sparse irqs: handle !GENIRQ platforms sparseirq: fix !SMP && !PCI_MSI && !HT_IRQ build sparseirq: fix Alpha build failure sparseirq: fix typo in !CONFIG_IO_APIC case x86, MSI: pass irq_cfg and irq_desc x86: MSI start irq numbering from nr_irqs_gsi x86: use NR_IRQS_LEGACY sparse irq_desc[] array: core kernel and x86 changes genirq: record IRQ_LEVEL in irq_desc[] irq.h: remove padding from irq_desc on 64bits
| | * genirq: record IRQ_LEVEL in irq_desc[]David Brownell2008-12-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: fix __irq_set_trigger() for IRQ_LEVEL When recording the irq trigger type, let's also make sure that IRQ_LEVEL gets set correctly. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | Merge commit 'v2.6.28-rc7' into core/lockingIngo Molnar2008-12-04
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| * | genirq: warn when IRQF_DISABLED may be ignoredDavid Brownell2008-12-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: emit new warning We periodically waste time tracking down problems from the genirq framework not respecting IRQF_DISABLED for some shared IRQ cases. Linus views this as "will not fix", but we're still left with the bugs caused by this misbehavior. This patch adds a nag message in request_irq(), so that drivers can fix their IRQ handlers to avoid this problem. Note that developers will never see the relevant bugs when they run with LOCKDEP, so it's no wonder these bugs are hard to find. (That also means LOCKDEP is overlooking some IRQ-related bugs involving IRQ handlers that don't set IRQF_DISABLED...) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | cpumask: make irq_set_affinity() take a const struct cpumaskRusty Russell2008-12-13
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: change existing irq_chip API Not much point with gentle transition here: the struct irq_chip's setaffinity method signature needs to change. Fortunately, not widely used code, but hits a few architectures. Note: In irq_select_affinity() I save a temporary in by mangling irq_desc[irq].affinity directly. Ingo, does this break anything? (Folded in fix from KOSAKI Motohiro) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Grant Grundler <grundler@parisc-linux.org> Acked-by: Ingo Molnar <mingo@redhat.com> Cc: ralf@linux-mips.org Cc: grundler@parisc-linux.org Cc: jeremy@xensource.com Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
* | genirq: __irq_set_trigger: change pr_warning to pr_debugMark Nelson2008-11-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 0c5d1eb77a8be917b638344a22afe1398236482b (genirq: record trigger type) caused powerpc platforms that had no set_type() function in their struct irq_chip to spew out warnings about "No set_type function for IRQ...". This warning isn't necessarily justified though because the generic powerpc platform code calls set_irq_type() (which in turn calls __irq_set_trigger) with information from the device tree to establish the interrupt mappings, regardless of whether the PIC can actually set a type. A platform's irq_chip might not have a set_type function for a variety of reasons, for example: the platform may have the type essentially hard-coded, or as in the case for Cell interrupts are just messages past around that have no real concept of type, or the platform could even have a virtual PIC as on the PS3. Signed-off-by: Mark Nelson <markn@au1.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | irq: fix typoIngo Molnar2008-11-09
| | | | | | | | | | | | | | | | Impact: build fix fix build failure on UP. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | genirq: fix the affinity setting in setup_irqThomas Gleixner2008-11-09
| | | | | | | | | | | | | | | | | | | | | | | | The affinity setting in setup irq is called before the NO_BALANCING flag is checked and might therefore override affinity settings from the calling code with the default setting. Move the NO_BALANCING flag check before the call to the affinity setting. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | genirq: keep affinities set from userspace across free/request_irq()Thomas Gleixner2008-11-09
|/ | | | | | | | | | | | | | | | | | Impact: preserve user-modified affinities on interrupts Kumar Galak noticed that commit 18404756765c713a0be4eb1082920c04822ce588 (genirq: Expose default irq affinity mask (take 3)) overrides an already set affinity setting across a free / request_irq(). Happens e.g. with ifdown/ifup of a network device. Change the logic to mark the affinities as set and keep them intact. This also fixes the unlocked access to irq_desc in irq_select_affinity() when called from irq_affinity_proc_write() Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* genirq: cleanup the sparseirq modificationsThomas Gleixner2008-10-16
| | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: HPET_MSI change IRQ affinity in process context when it is disabledvenkatesh.pallipadi@intel.com2008-10-16
| | | | | | | | Change the IRQ affinity in the process context when the IRQ is disabled. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: remove irqbalance in kernel for 32 bitYinghai Lu2008-10-16
| | | | | | | | This has been deprecated for years, the user space irqbalanced utility works better with numa, has configurable policies, etc... Signed-off-by: Yinghai Lu <yhlu.kernel@gmai.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86_64: rename irq_desc/irq_desc_allocYinghai Lu2008-10-16
| | | | | | | | | | | | | | change names: irq_desc() ==> irq_desc_alloc __irq_desc() ==> irq_desc Also split a few of the uses in lowlevel x86 code. v2: need to check if desc is null in smp_irq_move_cleanup Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* irq: remove >= nr_irqs checking with config_have_sparse_irqYinghai Lu2008-10-16
| | | | | | | | | | remove irq limit checks - nr_irqs is dynamic and we expand anytime. v2: fix checking about result irq_cfg_without_new, so could use msi again v3: use irq_desc_without_new to check irq is valid Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* irq: replace loop with nr_irqs with for_each_irq_descYinghai Lu2008-10-16
| | | | | | | | | | | | | | There are a handful of loops that go from 0 to nr_irqs and use get_irq_desc() on them. These would allocate all the irq_desc entries, regardless of the need for them. Use the smarter for_each_irq_desc() iterator that will only iterate over the present ones. v2: make sure arch without GENERIC_HARDIRQS work too Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* generic: sparse irqs: use irq_desc() together with dyn_array, instead of ↵Yinghai Lu2008-10-16
| | | | | | | | | | | | | | | | | | irq_desc[] add CONFIG_HAVE_SPARSE_IRQ to for use condensed array. Get rid of irq_desc[] array assumptions. Preallocate 32 irq_desc, and irq_desc() will try to get more. ( No change in functionality is expected anywhere, except the odd build failure where we missed a code site or where a crossing commit itroduces new irq_desc[] usage. ) v2: according to Eric, change get_irq_desc() to irq_desc() Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* irq: introduce nr_irqsYinghai Lu2008-10-16
| | | | | | | | | | | at this point nr_irqs is equal NR_IRQS convert a few easy users from NR_IRQS to dynamic nr_irqs. v2: according to Eric, we need to take care of arch without generic_hardirqs Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'linus' into genirqIngo Molnar2008-10-16
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| * Merge branch 'linus' into x86/coreIngo Molnar2008-08-14
| |\ | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/kernel/genapic_64.c include/asm-x86/kvm_host.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * \ Merge commit 'v2.6.27-rc1' into x86/coreIngo Molnar2008-07-30
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: include/asm-x86/dma-mapping.h include/asm-x86/namei.h include/asm-x86/uaccess.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * \ \ Merge branch 'x86/x2apic' into x86/coreIngo Molnar2008-07-26
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: include/asm-x86/i8259.h include/asm-x86/msidef.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * \ \ Merge branch 'linus' into x86/x2apicIngo Molnar2008-07-25
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/pci/dmar.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * \ \ \ Merge branch 'linus' into x86/x2apicIngo Molnar2008-07-18
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