Commit b0a284dc authored Apr 06, 2020 by Vitaly Kuznetsov Committed by Wei Liu Apr 23, 2020

Drivers: hv: make sure that 'struct vmbus_channel_message_header' compiles correctly



Strictly speaking, compiler is free to use something different from 'u32'
for 'enum vmbus_channel_message_type' (e.g. char) but it doesn't happen in
real life, just add a BUILD_BUG_ON() guardian.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200406104316.45303-1-vkuznets@redhat.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>

parent 5cc41500

drivers/hv/vmbus_drv.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -1051,6 +1051,13 @@ void vmbus_on_msg_dpc(unsigned long data)
		struct onmessage_work_context *ctx;
		u32 message_type = msg->header.message_type;

		/*
		* 'enum vmbus_channel_message_type' is supposed to always be 'u32' as
		* it is being used in 'struct vmbus_channel_message_header' definition
		* which is supposed to match hypervisor ABI.
		*/
		BUILD_BUG_ON(sizeof(enum vmbus_channel_message_type) != sizeof(u32));

		if (message_type == HVMSG_NONE)
		/* no msg */
		return;