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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2010-03-31 18:04:47 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-02 20:48:47 +0200 |
| commit | 472a474c6630efd195d3738339fd1bdc8aa3b1aa (patch) | |
| tree | 010b5b8191eba821b4940b4ab9fbd48ed468afa0 /mm | |
| parent | 51591e31dcb3716f03f962e26ec36a029aa46340 (diff) | |
| download | blackbird-op-linux-472a474c6630efd195d3738339fd1bdc8aa3b1aa.tar.gz blackbird-op-linux-472a474c6630efd195d3738339fd1bdc8aa3b1aa.zip | |
x86: Fix double enable_IR_x2apic() call on SMP kernel on !SMP boards
Jan Grossmann reported kernel boot panic while booting SMP
kernel on his system with a single core cpu. SMP kernels call
enable_IR_x2apic() from native_smp_prepare_cpus() and on
platforms where the kernel doesn't find SMP configuration we
ended up again calling enable_IR_x2apic() from the
APIC_init_uniprocessor() call in the smp_sanity_check(). Thus
leading to kernel panic.
Don't call enable_IR_x2apic() and default_setup_apic_routing()
from APIC_init_uniprocessor() in CONFIG_SMP case.
NOTE: this kind of non-idempotent and assymetric initialization
sequence is rather fragile and unclean, we'll clean that up
in v2.6.35. This is the minimal fix for v2.6.34.
Reported-by: Jan.Grossmann@kielnet.net
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: <jbarnes@virtuousgeek.org>
Cc: <david.woodhouse@intel.com>
Cc: <weidong.han@intel.com>
Cc: <youquan.song@intel.com>
Cc: <Jan.Grossmann@kielnet.net>
Cc: <stable@kernel.org> # [v2.6.32.x, v2.6.33.x]
LKML-Reference: <1270083887.7835.78.camel@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions
