Re: [Xen-devel] [PATCH] xenpaging: unify return value in nominate and evict

[Tim Deegan <tim@xxxxxxx>]

At 13:07 +0100 on 30 Jan (1327928841), Olaf Hering wrote:
> xenpaging: unify return value in nominate and evict
> 
> Let p2m_mem_paging_nominate and p2m_mem_paging_evict return just one
> error number. EINVAL is not very helpful in case of nominate, it can
> happen if the pager tries to nominate a ballooned page. In this case the
> gfn is not backed by a mfn, the pager can not know that.  Similar with
> evict, anything can happen between nominate and evict.
> 
> This change helps the pager to decide if the returned error is from the
> function itself, or if it happend earlier. In the latter case, it is
> most likely fatal and should be handled as such.
> nominate and evict return EBUSY, which is supposed to mean
> "pager request reached target function, and failed."

Applied, thanks.

Tim.

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