Re: [Xen-devel] [PATCH v2 01/11] xen: sched: make implementing .alloc_pdata optional

[Juergen Gross <jgross@xxxxxxxx>]

On 06/04/16 19:22, Dario Faggioli wrote:
> The .alloc_pdata scheduler hook must, before this change,
> be implemented by all schedulers --even those ones that
> don't need to allocate anything.
> 
> Make it possible to just use the SCHED_OP(), like for
> the other hooks, by using ERR_PTR() and IS_ERR() for
> error reporting. This:
>  - makes NULL a variant of success;
>  - allows for errors other than ENOMEM to be properly
>    communicated (if ever necessary).
> 
> This, in turn, means that schedulers not needing to
> allocate any per-pCPU data, can avoid implementing the
> hook. In fact, the artificial implementation of
> .alloc_pdata in the ARINC653 is removed (and, while there,
> nuke .free_pdata too, as it is equally useless).
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> Reviewed-by: Meng Xu <mengxu@xxxxxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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