[PATCH v5 2/4] powerpc/pseries: Update SCM hcall op-codes in hvcall.h

Michael Ellerman mpe at ellerman.id.au
Tue Jul 30 21:26:01 AEST 2019

David Gibson <david at gibson.dropbear.id.au> writes:
> On Tue, Jul 23, 2019 at 09:43:55PM +0530, Vaibhav Jain wrote:
>> Update the hvcalls.h to include op-codes for new hcalls introduce to
>> manage SCM memory. Also update existing hcall definitions to reflect
>> current papr specification for SCM.
>> The removed hcall op-codes H_SCM_MEM_QUERY, H_SCM_BLOCK_CLEAR were
>> transient proposals and there support was never implemented by
>> Power-VM nor they were used anywhere in Linux kernel. Hence we don't
>> expect anyone to be impacted by this change.
>> Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>
> They really should not have been merged while only interim proposals.
> But since they have changed, better to update them than not, obviously.

Yes, absolutely agree. It wasn't clear when I merged them that they were
*unpublished* and *unstable*.

Unfortunately we can't realistically wait for these APIs to be in a
published PAPR spec because it seems to take about 5 years for a PAPR
spec to escape the IBM firewall.


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