> Am 02.09.2020 um 12:15 schrieb Jürgen Groß <jgr...@suse.com>:
>
> On 21.08.20 12:34, David Hildenbrand wrote:
>> Let's reuse the new mechanism to merge system ram resources below the
>> root. We are the only one hotplugging system ram (e.g., DIMMs don't apply),
>> so this is safe to be used.
>> Cc: Andrew Morton <a...@linux-foundation.org>
>> Cc: Michal Hocko <mho...@suse.com>
>> Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
>> Cc: Juergen Gross <jgr...@suse.com>
>> Cc: Stefano Stabellini <sstabell...@kernel.org>
>> Cc: Roger Pau Monné <roger....@citrix.com>
>> Cc: Julien Grall <jul...@xen.org>
>> Cc: Pankaj Gupta <pankaj.gupta.li...@gmail.com>
>> Cc: Baoquan He <b...@redhat.com>
>> Cc: Wei Yang <richardw.y...@linux.intel.com>
>> Signed-off-by: David Hildenbrand <da...@redhat.com>
>> ---
>> drivers/xen/balloon.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
>> index 37ffccda8bb87..5ec73f752b8a7 100644
>> --- a/drivers/xen/balloon.c
>> +++ b/drivers/xen/balloon.c
>> @@ -338,6 +338,10 @@ static enum bp_state reserve_additional_memory(void)
>> if (rc) {
>> pr_warn("Cannot add additional memory (%i)\n", rc);
>> goto err;
>> + } else {
>> + resource = NULL;
>> + /* Try to reduce the number of system ram resources. */
>> + merge_system_ram_resources(&iomem_resource);
>> }
>
> I don't see the need for setting resource to NULL and to use an "else"
> clause here.
>
I set it to NULL because the pointer may be stale after that call - to avoid
future bugs. But I can drop it.
Ack to the „else“ case.
Thanks for having a look!
>
> Juergen
>
