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authorBjorn Helgaas <bhelgaas@google.com>2011-09-25 17:29:00 -0400
committerIngo Molnar <mingo@elte.hu>2011-12-05 07:46:27 -0500
commit9e6866686bdf2dcf3aeb0838076237ede532dcc8 (patch)
tree12a5a6e9ad6643f328a8ae7dbeda3e3d6632a7ac /arch/x86/kernel/cpu/mtrr/generic.c
parentefa221268566c2caa0e2a540068a2e8250fbb819 (diff)
x86/mpparse: Account for bus types other than ISA and PCI
In commit f8924e770e04 ("x86: unify mp_bus_info"), the 32-bit and 64-bit versions of MP_bus_info were rearranged to match each other better. Unfortunately it introduced a regression: prior to that change we used to always set the mp_bus_not_pci bit, then clear it if we found a PCI bus. After it, we set mp_bus_not_pci for ISA buses, clear it for PCI buses, and leave it alone otherwise. In the cases of ISA and PCI, there's not much difference. But ISA is not the only non-PCI bus, so it's better to always set mp_bus_not_pci and clear it only for PCI. Without this change, Dan's Dell PowerEdge 4200 panics on boot with a log indicating interrupt routing trouble unless the "noapic" option is supplied. With this change, the machine boots reliably without "noapic". Fixes http://bugs.debian.org/586494 Reported-bisected-and-tested-by: Dan McGrath <troubledaemon@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org # 2.6.26+ Cc: Dan McGrath <troubledaemon@gmail.com> Cc: Alexey Starikovskiy <aystarik@gmail.com> [jrnieder@gmail.com: clarified commit message] Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Link: http://lkml.kernel.org/r/20111122215000.GA9151@elie.hsd1.il.comcast.net Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/generic.c')
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