On 3/6/19 2:19 AM, Arnd Bergmann wrote:
> On Wed, Mar 6, 2019 at 12:51 AM John Hubbard <jhubbard@xxxxxxxxxx> wrote:
>>
>> With some Kconfig local hacks that removed all HUGE* support, while leaving
>> HMM enabled, I was able to reproduce your results, and also to verify the
>> fix. It also makes sense from reading it.
>
> Thanks for the confirmation.
>
>> Also, I ran into one more warning as well:
>>
>> mm/hmm.c: In function ‘hmm_vma_walk_pud’:
>> mm/hmm.c:764:25: warning: unused variable ‘vma’ [-Wunused-variable]
>> struct vm_area_struct *vma = walk->vma;
>> ^~~
>>
>> ...which can be fixed like this:
>>
>> diff --git a/mm/hmm.c b/mm/hmm.c
>> index c4beb1628cad..c1cbe82d12b5 100644
>> --- a/mm/hmm.c
>> +++ b/mm/hmm.c
>> @@ -761,7 +761,6 @@ static int hmm_vma_walk_pud(pud_t *pudp,
>> {
>> struct hmm_vma_walk *hmm_vma_walk = walk->private;
>> struct hmm_range *range = hmm_vma_walk->range;
>> - struct vm_area_struct *vma = walk->vma;
>> unsigned long addr = start, next;
>> pmd_t *pmdp;
>> pud_t pud;
>> @@ -807,7 +806,7 @@ static int hmm_vma_walk_pud(pud_t *pudp,
>> return 0;
>> }
>>
>> - split_huge_pud(vma, pudp, addr);
>> + split_huge_pud(walk->vma, pudp, addr);
>> if (pud_none(*pudp))
>> goto again;
>>
>> ...so maybe you'd like to fold that into your patch?
>
> I also ran into this one last night during further randconfig testing,
> and came up with the same patch that you showed here. I'll
> send this one to Andrew and add a Reported-by line for you,
> since he already merged the first patch.
>
> I'll leave it up to Andrew to fold the fixes into one, or into the original
> patches if he thinks that makes sense.
>
> Arnd
>
Sounds good!
thanks,
--
John Hubbard
NVIDIA
