[PATCH v06 3/5] migration/memory: Add hotplug READD_MULTIPLE

[Michael Ellerman]

Tyrel Datwyler <tyreld at linux.vnet.ibm.com> writes:
> On 10/15/2018 05:39 PM, Michael Ellerman wrote:
>> Michael Bringmann <mwb at linux.vnet.ibm.com> writes:
>>> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
>>> index 2b796da..9c76345 100644
>>> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
>>> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
>>> @@ -541,6 +549,23 @@ static int dlpar_memory_readd_by_index(u32 drc_index)
>>>  	return rc;
>>>  }
>>>
>>> +static int dlpar_memory_readd_multiple(void)
>>> +{
>>> +	struct drmem_lmb *lmb;
>>> +	int rc;
>>> +
>>> +	pr_info("Attempting to update multiple LMBs\n");
>>> +
>>> +	for_each_drmem_lmb(lmb) {
>>> +		if (drmem_lmb_update(lmb)) {
>>> +			rc = dlpar_memory_readd_helper(lmb);
>>> +			drmem_remove_lmb_update(lmb);
>>> +		}
>>> +	}
>>> +
>>> +	return rc;
>>> +}
>> 
>> This leaves rc potentially uninitialised.
>> 
>> What should the result be in that case, -EINVAL ?
>
> On another note if there are multiple LMBs to update the value of rc
> only reflects the final dlpar_memory_readd_helper() call.

Good point.

cheers