1
linux/include
Alan Cox 4f27c00bf8 Improve behaviour of spurious IRQ detect
Currently we handle spurious IRQ activity based upon seeing a lot of
invalid interrupts, and we clear things back on the base of lots of valid
interrupts.

Unfortunately in some cases you get legitimate invalid interrupts caused by
timing asynchronicity between the PCI bus and the APIC bus when disabling
interrupts and pulling other tricks.  In this case although the spurious
IRQs are not a problem our unhandled counters didn't clear and they act as
a slow running timebomb.  (This is effectively what the serial port/tty
problem that was fixed by clearing counters when registering a handler
showed up)

It's easy enough to add a second parameter - time.  This means that if we
see a regular stream of harmless spurious interrupts which are not harming
processing we don't go off and do something stupid like disable the IRQ
after a month of running.  OTOH lockups and performance killers show up a
lot more than 10/second

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-16 09:05:46 -07:00
..
acpi
asm-alpha fix alpha ISA support 2007-07-16 09:05:37 -07:00
asm-arm page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-arm26 dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
asm-avr32 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-blackfin
asm-cris etrax: enable arbitary speed setting on tty ports 2007-07-16 09:05:38 -07:00
asm-frv FRV: Connect up new syscalls 2007-07-16 09:05:37 -07:00
asm-generic Introduce O_CLOEXEC 2007-07-16 09:05:45 -07:00
asm-h8300 dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
asm-i386 fix jvc cdrom drive lockup 2007-07-16 09:05:40 -07:00
asm-ia64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-m32r dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
asm-m68k page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-m68knommu
asm-mips page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-parisc Introduce O_CLOEXEC 2007-07-16 09:05:45 -07:00
asm-powerpc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-ppc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-s390 dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
asm-sh page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sh64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sparc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sparc64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-um Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE 2007-07-16 09:05:38 -07:00
asm-v850 v850: enable arbitary speed tty ioctls 2007-07-16 09:05:39 -07:00
asm-x86_64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-xtensa page table handling cleanup 2007-07-16 09:05:36 -07:00
crypto
keys
linux Improve behaviour of spurious IRQ detect 2007-07-16 09:05:46 -07:00
math-emu
media
mtd
net Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2007-07-15 16:50:46 -07:00
pcmcia
rdma
rxrpc
scsi [SCSI] Remove unused method scsi_device_cancel 2007-07-14 16:01:16 -05:00
sound
video
Kbuild