linux/kernel/irq, branch v2.6.26.8

genirq: reenable a nobody cared disabled irq when a new driver arrives

2008-05-02T11:40:34Z

Uwe Kleine-Koenig has some strange hardware where one of the shared interrupts can be asserted during boot before the appropriate driver loads. Requesting the shared irq line from another driver result in a spurious interrupt storm which finally disables the interrupt line. I have seen similar behaviour on resume before (the hardware does not work anymore so I can not verify). Change the spurious disable logic to increment the disable depth and mark the interrupt with an extra flag which allows us to reenable the interrupt when a new driver arrives which requests the same irq line. In the worst case this will disable the irq again via the spurious trap, but there is a decent chance that the new driver is the one which can handle the already asserted interrupt and makes the box usable again. Eric Biederman said further: This case also happens on a regular basis in kdump kernels where we deliberately don't shutdown the hardware before starting the new kernel. This patch should reduce the need for using irqpoll in that situation by a small amount. Signed-off-by: Thomas Gleixner Tested-and-Acked-by: Uwe Kleine-König

kernel: explicitly include required header files under kernel/

2008-04-29T15:06:04Z

Following an experimental deletion of the unnecessary directive #include from the header file , these files under kernel/ were exposed as needing to include one of or , so explicit includes were added where necessary. Signed-off-by: Robert P. J. Day Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

cpumask: Cleanup more uses of CPU_MASK and NODE_MASK

2008-04-19T17:44:58Z

* Replace usages of CPU_MASK_NONE, CPU_MASK_ALL, NODE_MASK_NONE, NODE_MASK_ALL to reduce stack requirements for large NR_CPUS and MAXNODES counts. * In some cases, the cpumask variable was initialized but then overwritten with another value. This is the case for changes like this: - cpumask_t oldmask = CPU_MASK_ALL; + cpumask_t oldmask; Signed-off-by: Mike Travis Signed-off-by: Ingo Molnar

genirq: do not leave interupts enabled on free_irq

2008-02-19T09:43:58Z

The default_disable() function was changed in commit: 76d2160147f43f982dfe881404cfde9fd0a9da21 genirq: do not mask interrupts by default It removed the mask function in favour of the default delayed interrupt disabling. Unfortunately this also broke the shutdown in free_irq() when the last handler is removed from the interrupt for those architectures which rely on the default implementations. Now we can end up with a enabled interrupt line after the last handler was removed, which can result in spurious interrupts. Fix this by adding a default_shutdown function, which is only installed, when the irqchip implementation does provide neither a shutdown nor a disable function. [@stable: affected versions: .21 - .24 ] Pointed-out-by: Michael Hennerich Signed-off-by: Thomas Gleixner Acked-by: Ingo Molnar Cc: stable@kernel.org Tested-by: Michael Hennerich

genirq: spurious.c: use time_* macros

2008-02-19T09:43:58Z

The functions time_before, time_before_eq, time_after, and time_after_eq are more robust for comparing jiffies against other values. So following patch implements usage of the time_after() macro, defined at linux/jiffies.h, which deals with wrapping correctly Signed-off-by: S.Caglar Onur Acked-by: Ingo Molnar Signed-off-by: Thomas Gleixner

IRQ_NOPROBE helper functions

2008-02-08T17:22:42Z

Probing non-ISA interrupts using the handle_percpu_irq as their handle_irq method may crash the system because handle_percpu_irq does not check IRQ_WAITING. This for example hits the MIPS Qemu configuration. This patch provides two helper functions set_irq_noprobe and set_irq_probe to set rsp. clear the IRQ_NOPROBE flag. The only current caller is MIPS code but this really belongs into generic code. As an aside, interrupt probing these days has become a mostly obsolete if not dangerous art. I think Linux interrupts should be changed to default to non-probing but that's subject of this patch. Signed-off-by: Ralf Baechle Acked-and-tested-by: Rob Landley Cc: Alan Cox Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kernel: remove fastcall in kernel/*

2008-02-08T17:22:31Z

[akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Harvey Harrison Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

genirq: stackdump after the "Trying to free already-free IRQ" message

2008-01-30T12:33:24Z

these bugs are harder to find than they seem, a stackdump helps. make it dependent on CONFIG_DEBUG_SHIRQ so that people can turn it off if it annoys them. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner

x86: add /proc/irq/*/spurious to dump the spurious irq debugging state

2008-01-30T12:32:48Z

This is useful to debug problems with interrupt handlers that return sometimes IRQ_NONE. Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner

genirq: turn irq debugging options into module params

2008-01-30T12:32:48Z

This allows to change them at runtime using sysfs. No need to reboot to set them. I only added aliases (kernel.noirqdebug etc.) so the old options still work. Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner