pseries: Return the token when we register an RTAS call
The kernel will soon be able to service some RTAS calls. However the choice of tokens will still be up to userspace. To support this have spapr_rtas_register() return the token that is allocated for an RTAS call, that allows the calling code to tell the kernel what the token value is. Signed-off-by: NMichael Ellerman <michael@ellerman.id.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NAlexander Graf <agraf@suse.de>
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