kernel_optimize_test/arch/ia64
Russ Anderson e1b1eb011e [IA64] Fix race when multiple cpus go through MCA
Additional testing uncovered a situation where the MCA recovery code could
hang due to a race condition.

According to the SAL spec, SAL sends a rendezvous interrupt to all but the first
CPU that goes into MCA.  This includes other CPUs that go into MCA at the same
time.  Those other CPUs will go into the linux MCA handler (rather than the
slave loop) with the rendezvous interrupt pending.  When all the CPUs have
completed MCA processing and the last monarch completes, freeing all the CPUs,
the CPUs with the pended rendezvous interrupt then go into the
ia64_mca_rendez_int_handler().  In ia64_mca_rendez_int_handler() the CPUs
get marked as rendezvoused, but then leave the handler (due to no MCA).
That leaves the CPUs marked as rendezvoused _before_ the next MCA event.

When the next MCA hits, the monarch will mistakenly believe that all the CPUs
are rendezvoused when they are not, opening up a window where a CPU can get
stuck in the slave loop.

This patch avoids leaving CPUs marked as rendezvoused when they are not.

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2007-10-12 15:19:02 -07:00
..
configs [IA64] Update arch/ia64/configs/* s/SLAB/SLUB/ 2007-08-13 14:54:34 -07:00
dig [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
hp [IA64] add driver for ACPI methods to call native firmware 2007-10-12 15:11:43 -07:00
ia32 i386/x86_64: move headers to include/asm-x86 2007-10-11 11:20:03 +02:00
kernel [IA64] Fix race when multiple cpus go through MCA 2007-10-12 15:19:02 -07:00
lib missing exports of csum_... 2007-07-17 11:01:07 -07:00
mm Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2007-09-04 00:43:57 -07:00
oprofile Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci [IA64] Nail two more simple section mismatch errors 2007-07-25 13:08:41 -07:00
scripts
sn [IA64] SN: Add support for CPU disable 2007-09-01 02:49:57 -07:00
defconfig [IA64] Update arch/ia64/configs/* s/SLAB/SLUB/ 2007-08-13 14:54:34 -07:00
install.sh
Kconfig [IA64] add driver for ACPI methods to call native firmware 2007-10-12 15:11:43 -07:00
Kconfig.debug [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu 2005-11-07 07:53:35 -08:00
Makefile [IA64] add vmlinuz target 2006-06-21 14:31:07 -07:00
module.lds