Drivers: hv: Eliminate the channel spinlock in the callback path
By ensuring that we set the callback handler to NULL in the channel close
path on the same CPU that the channel is bound to, we can eliminate this lock
acquisition and release in a performance critical path.
Signed-off-by: K. Y. Srinivasan <[email protected]>
Reviewed-by: Haiyang Zhang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2d7b4f1..a274e08 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -696,6 +696,8 @@
* preserve the earlier behavior.
*/
u32 target_vp;
+ /* The corresponding CPUID in the guest */
+ u32 target_cpu;
/*
* Support for sub-channels. For high performance devices,
* it will be useful to have multiple sub-channels to support
