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| author | Ian Campbell | 2011-02-18 17:43:31 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk | 2011-03-10 20:44:39 +0100 |
| commit | 5cad61a6ba6f4956a218ffbb64cafcc1daefaca0 (patch) | |
| tree | 96b25ef58b3bba37808fe3cd7bbb37a444187260 /Kconfig | |
| parent | xen: pci: collapse apic_register_gsi_xen_hvm and xen_hvm_register_pirq (diff) | |
| download | kernel-qcow2-linux-5cad61a6ba6f4956a218ffbb64cafcc1daefaca0.tar.gz kernel-qcow2-linux-5cad61a6ba6f4956a218ffbb64cafcc1daefaca0.tar.xz kernel-qcow2-linux-5cad61a6ba6f4956a218ffbb64cafcc1daefaca0.zip | |
xen: events: assume PHYSDEVOP_get_free_pirq exists
The find_unbound_pirq is called only from xen_allocate_pirq_msi and
only if alloc_pirq is true. The only caller which does this is
xen_hvm_setup_msi_irqs. The use of this function is gated, in
pci_xen_hvm_init, on XENFEAT_hvm_pirqs.
The PHYSDEVOP_get_free_pirq interfaces was added to the hypervisor in
22410:be96f6058c05 while XENFEAT_hvm_pirqs was added a couple of
minutes prior in 22409:6663214f06ac. Therefore we do not need to
concern ourselves with hypervisors which support XENFEAT_hvm_pirqs but
not PHYSDEVOP_get_free_pirq.
This eliminates the fallback path in find_unbound_pirq which walks to
pirq_to_irq array looking for a free pirq. Unlike the
PHYSDEVOP_get_free_pirq interface this fallback only looks up a free
pirq but does not reserve it. Removing this fallback will simplify
locking in the future.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'Kconfig')
0 files changed, 0 insertions, 0 deletions