RE: [PATCH v3 09/11] HID: hyperv: Make ringbuffer at least take two pages

[Michael Kelley]

From: Boqun Feng <boqun.feng@xxxxxxxxx> Sent: Thursday, September 10, 2020 7:35 AM
> 
> When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at
> least 2 * PAGE_SIZE: one page for the header and at least one page of
> the data part (because of the alignment requirement for double mapping).
> 
> So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when
> using vmbus_open() to establish the vmbus connection.
> 
> Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
> Acked-by: Jiri Kosina <jkosina@xxxxxxx>
> ---
> Hi Jiri,
> 
> Thanks for your acked-by. I make a small change in this version (casting
> 2 * PAGE_SIZE into int to avoid compiler warnings), and it make no
> functional change. If the change is inappropriate, please let me know.
> 
>  drivers/hid/hid-hyperv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Reviewed-by:  Michael Kelley <mikelley@xxxxxxxxxxxxx>