[...]

> All warnings (new ones prefixed by >>):
> 
>     drivers/base/memory.c: In function 'init_memory_block':
>>> drivers/base/memory.c:573:16: warning: variable 'start_pfn' set but not used [-Wunused-but-set-variable]
>       573 |  unsigned long start_pfn;
>           |                ^~~~~~~~~

Indeed, we no longer need start_pfn in init_memory_block().

-- 
Thanks,

David / dhildenb