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Current ia64 linux cannot handle greater than 184 interrupt sources because of the lack of vectors. The following patch enables ia64 linux to handle greater than 184 interrupt sources by allowing the same vector number to be shared by multiple IOSAPIC's RTEs. The design of this patch is besed on "Intel(R) Itanium(R) Processor Family Interrupt Architecture Guide". Even if you don't have a large I/O system, you can see the behavior of vector sharing by changing IOSAPIC_LAST_DEVICE_VECTOR to fewer value. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com> |
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