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Groups > linux.kernel > #1651950
| From | Andy Shevchenko <andy.shevchenko@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v4 05/10] hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT |
| Date | 2017-05-27 20:00 +0200 |
| Message-ID | <tLOam-7br-7@gated-at.bofh.it> (permalink) |
| References | <tKDh0-2cD-7@gated-at.bofh.it> <tKDh1-2cD-33@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, May 24, 2017 at 3:04 PM, Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
> We need to pass only 8 bytes of input for HvSignalEvent which makes it a
> perfect fit for fast hypercall. hv_input_signal_event_buffer is not needed
> any more and hv_input_signal_event is converted to union for convenience.
> +union hv_input_signal_event {
Union aliasing is UB. Avoid it for good.
> + u64 as_uint64;
> + struct {
> + union hv_connection_id connectionid;
> + u16 flag_number;
> + u16 rsvdz;
> + };
> };
--
With Best Regards,
Andy Shevchenko
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Re: [PATCH v4 05/10] hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-05-27 20:00 +0200
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