On 18/12/2014 04:15, Wu, Feng wrote:
> Thanks for your comments, Paolo!
>
> If we use u64 new_control, we cannot use new.sn any more.
> Maybe we can change the struct pi_desc {} like this:
>
> typedef struct pid_control{
> u64 on : 1,
> sn : 1,
> rsvd_1 : 13,
> ndm : 1,
> nv : 8,
> rsvd_2 : 8,
> ndst : 32;
> }pid_control_t;
>
> struct pi_desc {
> u32 pir[8]; /* Posted interrupt requested */
> pid_control_t control;
Probably something like this to keep the union:
typedef union pid_control {
u64 full;
struct {
u64 on : 1,
...
} fields;
};
> u32 rsvd[6];
> } __aligned(64);
>
>
> Then we can define pid_control_t new_control, old_control. And use
> new_control.sn = 0.
>
> What is your opinon?
Sure. Alternatively, keep using struct pi_desc new; just
do not zero it, nor access any field outide the control word.
Paolo
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