04-25-2011
Thank you all for making suggestions. I had to restart the computer as a result of a refurbishing of the room the machine is in and the issue did not reoccur. The /var/log/messages file has about 20 occurrences of the warning line, but the cause remains unclear. I am considering this solved.
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LEARN ABOUT SUSE
struct_irq_chip
STRUCT
IRQ_CHIP(9) Structures STRUCT IRQ_CHIP(9)
NAME
struct_irq_chip - hardware interrupt chip descriptor
SYNOPSIS
struct irq_chip {
const char * name;
unsigned int (* startup) (unsigned int irq);
void (* shutdown) (unsigned int irq);
void (* enable) (unsigned int irq);
void (* disable) (unsigned int irq);
void (* ack) (unsigned int irq);
void (* mask) (unsigned int irq);
void (* mask_ack) (unsigned int irq);
void (* unmask) (unsigned int irq);
void (* eoi) (unsigned int irq);
void (* end) (unsigned int irq);
int (* set_affinity) (unsigned int irq,const struct cpumask *dest);
int (* retrigger) (unsigned int irq);
int (* set_type) (unsigned int irq, unsigned int flow_type);
int (* set_wake) (unsigned int irq, unsigned int on);
void (* bus_lock) (unsigned int irq);
void (* bus_sync_unlock) (unsigned int irq);
#ifdef CONFIG_IRQ_RELEASE_METHOD
void (* release) (unsigned int irq, void *dev_id);
#endif
const char * typename;
};
MEMBERS
name
name for /proc/interrupts
startup
start up the interrupt (defaults to ->enable if NULL)
shutdown
shut down the interrupt (defaults to ->disable if NULL)
enable
enable the interrupt (defaults to chip->unmask if NULL)
disable
disable the interrupt
ack
start of a new interrupt
mask
mask an interrupt source
mask_ack
ack and mask an interrupt source
unmask
unmask an interrupt source
eoi
end of interrupt - chip level
end
end of interrupt - flow level
set_affinity
set the CPU affinity on SMP machines
retrigger
resend an IRQ to the CPU
set_type
set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
set_wake
enable/disable power-management wake-on of an IRQ
bus_lock
function to lock access to slow bus (i2c) chips
bus_sync_unlock
function to sync and unlock slow bus (i2c) chips
release
release function solely used by UML
typename
obsoleted by name, kept as migration helper
AUTHORS
Thomas Gleixner <tglx@linutronix.de>
Author.
Ingo Molnar <mingo@elte.hu>
Author.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT IRQ_CHIP(9)