x86/apic/x2apic: Limit the vector reservation to the user specified mask
authorSuresh Siddha <suresh.b.siddha@intel.com>
Mon, 25 Jun 2012 20:38:28 +0000 (13:38 -0700)
committerIngo Molnar <mingo@kernel.org>
Fri, 6 Jul 2012 09:00:22 +0000 (11:00 +0200)
commit1ac322d0b169c95ce34d55b3ed6d40ce1a5f3a02
tree21a911ca299c18c3c29569af1abf768230c7990a
parentb39f25a849d7677a7dbf183f2483fd41c201a5ce
x86/apic/x2apic: Limit the vector reservation to the user specified mask

For the x2apic cluster mode, vector for an interrupt is
currently reserved on all the cpu's that are part of the x2apic
cluster. But the interrupts will be routed only to the cluster
(derived from the first cpu in the mask) members specified in
the mask. So there is no need to reserve the vector in the
unused cluster members.

Modify __assign_irq_vector() to reserve the vectors based on the
user specified irq destination mask. If the new mask is a proper
subset of the currently used mask, cleanup the vector allocation
on the unused cpu members.

Also, allow the apic driver to tune the vector domain based on
the affinity mask (which in most cases is the user-specified
mask).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Link: http://lkml.kernel.org/r/1340656709-11423-3-git-send-email-suresh.b.siddha@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/apic.h
arch/x86/kernel/apic/apic_noop.c
arch/x86/kernel/apic/io_apic.c
arch/x86/kernel/apic/x2apic_cluster.c
arch/x86/kernel/vsmp_64.c