[PATCH] PCI: fix sparse warning about pci_bus_flags

[Roland Dreier <rdreier@cisco.com>]

Sparse warns about casting to a __bitwise type.  However, it's correct
to do when defining the enum for pci_bus_flags_t, so add a __force to
quiet the warnings.  This will fix getting

    include/linux/pci.h:100:26: warning: cast to restricted type

from sparse all over the build.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0aad5a3..09ff282 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -97,7 +97,7 @@ enum pci_channel_state {
 
 typedef unsigned short __bitwise pci_bus_flags_t;
 enum pci_bus_flags {
-	PCI_BUS_FLAGS_NO_MSI = (pci_bus_flags_t) 1,
+	PCI_BUS_FLAGS_NO_MSI = (__force pci_bus_flags_t) 1,
 };
 
 /*
-
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