On Wed, Jun 26, 2013 at 10:26:10AM -0700, Greg KH wrote: > On Wed, Jun 26, 2013 at 09:26:35AM -0400, Neil Horman wrote: > > A few years back intel published a spec update: > > http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chipset-ioh-specification-update.pdf > > > > For the 5520 and 5500 chipsets which contained an errata (specificially errata > > 53), which noted that these chipsets can't properly do interrupt remapping, and > > as a result the recommend that interrupt remapping be disabled in bios. While > > many vendors have a bios update to do exactly that, not all do, and of course > > not all users update their bios to a level that corrects the problem. As a > > result, occasionally interrupts can arrive at a cpu even after affinity for that > > interrupt has be moved, leading to lost or spurrious interrupts (usually > > characterized by the message: > > kernel: do_IRQ: 7.71 No irq handler for vector (irq -1) > > > > There have been several incidents recently of people seeing this error, and > > investigation has shown that they have system for which their BIOS level is such > > that this feature was not properly turned off. As such, it would be good to > > give them a reminder that their systems are vulnurable to this problem. For > > details of those that reported the problem, please see: > > https://bugzilla.redhat.com/show_bug.cgi?id=887006 > > > > [ Joerg: Removed CONFIG_IRQ_REMAP ifdef from early-quirks.c ] > > > > Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx> > > CC: Prarit Bhargava <prarit@xxxxxxxxxx> > > CC: Don Zickus <dzickus@xxxxxxxxxx> > > CC: Don Dutile <ddutile@xxxxxxxxxx> > > CC: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > CC: Asit Mallick <asit.k.mallick@xxxxxxxxx> > > CC: David Woodhouse <dwmw2@xxxxxxxxxxxxx> > > CC: linux-pci@xxxxxxxxxxxxxxx > > CC: Joerg Roedel <joro@xxxxxxxxxx> > > CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > > CC: Arkadiusz Miskiewicz <arekm@xxxxxxxx> > > CC: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> > > Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx> > > --- > > arch/x86/include/asm/irq_remapping.h | 3 +++ > > arch/x86/kernel/early-quirks.c | 20 ++++++++++++++++++++ > > drivers/iommu/intel_irq_remapping.c | 10 ++++++++++ > > drivers/iommu/irq_remapping.c | 6 ++++++ > > drivers/iommu/irq_remapping.h | 2 ++ > > 5 files changed, 41 insertions(+) > > Please let me know what the git commit id of the patch you are asking to > be applied is, in Linus's tree. Otherwise I'll just assume you are > trying to get a patch into a stable branch that isn't in Linus's tree, > which isn't allowed, and I know you know better than to try to do that > :) > Sorry, I normally do a cherry-pick -x, fat fingered it in my rush :). As was previously noted, its from commit 03bbcb2e7e292838bb0244f5a7816d194c911d62 Neil > thanks, > > greg k-h > -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html