Re: [PATCH 1/5] mm/resource: return real error codes from walk failures

[Dave Hansen <dave.hansen@intel.com>]

On 1/25/19 1:02 PM, Bjorn Helgaas wrote:
>> @@ -453,7 +453,7 @@ int walk_system_ram_range(unsigned long
>>         unsigned long flags;
>>         struct resource res;
>>         unsigned long pfn, end_pfn;
>> -       int ret = -1;
>> +       int ret = -EINVAL;
> Can you either make a similar change to the powerpc version of
> walk_system_ram_range() in arch/powerpc/mm/mem.c or explain why it's
> not needed?  It *seems* like we'd want both versions of
> walk_system_ram_range() to behave similarly in this respect.

Sure.  A quick grep shows powerpc being the only other implementation.
I'll just add this hunk:

> diff -puN arch/powerpc/mm/mem.c~memory-hotplug-walk_system_ram_range-returns-neg-1 arch/powerpc/mm/mem.c
> --- a/arch/powerpc/mm/mem.c~memory-hotplug-walk_system_ram_range-returns-neg-1  2019-01-25 12:57:00.000004446 -0800
> +++ b/arch/powerpc/mm/mem.c     2019-01-25 12:58:13.215004263 -0800 
> @@ -188,7 +188,7 @@ walk_system_ram_range(unsigned long star 
>         struct memblock_region *reg; 
>         unsigned long end_pfn = start_pfn + nr_pages; 
>         unsigned long tstart, tend; 
> -       int ret = -1; 
> +       int ret = -EINVAL; 

I'll also dust off the ol' cross-compiler and make sure I didn't
fat-finger anything.