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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>
This commit is contained in:
Vitaly Kuznetsov 2020-04-06 12:43:15 +02:00 committed by Wei Liu
parent 5cc415001b
commit b0a284dc65
1 changed files with 7 additions and 0 deletions
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7
drivers/hv/vmbus_drv.c
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@ -1051,6 +1051,13 @@ void vmbus_on_msg_dpc(unsigned long data)
struct onmessage_work_context *ctx; struct onmessage_work_context *ctx;
u32 message_type = msg->header.message_type; 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) if (message_type == HVMSG_NONE)
/* no msg */ /* no msg */
return; return;