linux/arch/ia64
Bryan Sutula 76e677e25d [IA64] Avoid kernel hang during CMC interrupt storm
I've noticed a kernel hang during a storm of CMC interrupts, which was
tracked down to the continual execution of the interrupt handler.

There's code in the CMC handler that's supposed to disable CMC
interrupts and switch to polling mode when it sees a bunch of CMCs.
Because disabling CMCs across all CPUs isn't safe in interrupt context,
the disable is done with a schedule_work().  But with continual CMC
interrupts, the schedule_work() never gets executed.

The following patch immediately disables CMC interrupts for the current
CPU.  This then allows (at least) one CPU to ignore CMC interrupts,
execute the schedule_work() code, and disable CMC interrupts on the rest
of the CPUs.

Acked-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Bryan Sutula <Bryan.Sutula@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2005-10-06 15:04:11 -07:00
..
configs [IA64] Manual merge fix for 3 files 2005-09-08 14:27:13 -07:00
dig Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hp [IA64] Fix simscsi for new SCSI midlayer 2005-09-22 10:42:39 -07:00
ia32 [PATCH] error path in setup_arg_pages() misses vm_unacct_memory() 2005-09-14 11:18:13 -07:00
kernel [IA64] Avoid kernel hang during CMC interrupt storm 2005-10-06 15:04:11 -07:00
lib [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
mm Pull sim-fixes into release branch 2005-09-11 14:27:15 -07:00
oprofile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci [IA64] Minor cleanups - remove CONFIG_ACPI_DEALLOCATE_IRQ 2005-09-07 14:00:08 -07:00
scripts Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sn Pull sn-features into release branch 2005-09-11 14:34:23 -07:00
defconfig [IA64] Manual merge fix for 3 files 2005-09-08 14:27:13 -07:00
install.sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
Kconfig.debug [PATCH] Kprobes/IA64: arch specific handling 2005-06-23 09:45:22 -07:00
Makefile [IA64] fix circular dependency on generation of asm-offsets.h 2005-09-13 08:50:39 -07:00
module.lds Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00