linux/kernel/irq, branch v2.6.37

genirq: Fix incorrect proc spurious output

2010-12-01T07:44:26Z

Since commit a1afb637(switch /proc/irq/*/spurious to seq_file) all /proc/irq/XX/spurious files show the information of irq 0. Current irq_spurious_proc_open() passes on NULL as the 3rd argument, which is used as an IRQ number in irq_spurious_proc_show(), to the single_open(). Because of this, all the /proc/irq/XX/spurious file shows IRQ 0 information regardless of the IRQ number. To fix the problem, irq_spurious_proc_open() must pass on the appropreate data (IRQ number) to single_open(). Signed-off-by: Kenji Kaneshige Reviewed-by: Yong Zhang LKML-Reference: <4CF4B778.90604@jp.fujitsu.com> Cc: stable@kernel.org [2.6.33+] Signed-off-by: Thomas Gleixner

Merge branches 'irq-core-for-linus' and 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2010-11-01T00:40:24Z

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: genirq: Fix up irq_node() for irq_data changes. genirq: Add single IRQ reservation helper genirq: Warn if enable_irq is called before irq is set up * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: semaphore: Remove mutex emulation staging: Final semaphore cleanup jbd2: Convert jbd2_slab_create_sem to mutex hpfs: Convert sbi->hpfs_creation_de to mutex Fix up trivial change/delete conflicts with deleted 'dream' drivers (drivers/staging/dream/camera/{mt9d112.c,mt9p012_fox.c,mt9t013.c,s5k3e2fx.c})

/proc/stat: fix scalability of irq sum of all cpu

2010-10-28T01:03:13Z

In /proc/stat, the number of per-IRQ event is shown by making a sum each irq's events on all cpus. But we can make use of kstat_irqs(). kstat_irqs() do the same calculation, If !CONFIG_GENERIC_HARDIRQ, it's not a big cost. (Both of the number of cpus and irqs are small.) If a system is very big and CONFIG_GENERIC_HARDIRQ, it does for_each_irq() for_each_cpu() - look up a radix tree - read desc->irq_stat[cpu] This seems not efficient. This patch adds kstat_irqs() for CONFIG_GENRIC_HARDIRQ and change the calculation as for_each_irq() look up radix tree for_each_cpu() - read desc->irq_stat[cpu] This reduces cost. A test on (4096cpusp, 256 nodes, 4592 irqs) host (by Jack Steiner) %time cat /proc/stat > /dev/null Before Patch: 2.459 sec After Patch : .561 sec [akpm@linux-foundation.org: unexport kstat_irqs, coding-style tweaks] [akpm@linux-foundation.org: fix unused variable 'per_irq_sum'] Signed-off-by: KAMEZAWA Hiroyuki Tested-by: Jack Steiner Acked-by: Jack Steiner Cc: Yinghai Lu Cc: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

genirq: Warn if enable_irq is called before irq is set up

2010-10-22T14:10:29Z

The recent changes in the genirq core unearthed a bug in arch/um which called enable_irq() before the interrupt was set up. Warn and return instead of crashing the machine with a NULL pointer dereference. Signed-off-by: Thomas Gleixner Cc: Richard Weinberger

genirq: Fix CONFIG_GENIRQ_NO_DEPRECATED=y build

2010-10-12T19:59:55Z

This option can be set to verify the full conversion to the new chip functions. Fix the fallout of the patch rework, so the core code compiles and works with it. Signed-off-by: Thomas Gleixner

genirq: Switch sparse_irq allocator to GFP_KERNEL

2010-10-12T14:53:45Z

The allocator functions are now called outside of preempt disabled regions. Switch to GFP_KERNEL. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar

genirq: Make sparse_lock a mutex

2010-10-12T14:53:45Z

No callers from atomic regions. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar

genirq: Remove the now unused sparse irq leftovers

2010-10-12T14:53:44Z

The move_irq_desc() function was only used due to the problem that the allocator did not free the old descriptors. So the descriptors had to be moved in create_irq_nr(). That's history. The code would have never been able to move active interrupt descriptors on affinity settings. That can be done in a completely different way w/o all this horror. Remove all of it. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar

genirq: Sanitize dynamic irq handling

2010-10-12T14:53:44Z

Use the cleanup functions of the dynamic allocator. No need to have separate implementations. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar

genirq: Remove arch_init_chip_data()

2010-10-12T14:53:44Z

This function should have not been there in the first place. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar