[RFC PATCH 3/3] mm/hugetlb: Remove pmd_huge_split_prepare

[Aneesh Kumar K.V]

On 07/27/2017 06:27 PM, Michal Hocko wrote:
> On Thu 27-07-17 14:07:56, Aneesh Kumar K.V wrote:
>> Instead of marking the pmd ready for split, invalidate the pmd. This should
>> take care of powerpc requirement.
> 
> which is?

I can add the commit which explain details here. Or add more details 
from the older commit here.

c777e2a8b65420b31dac28a453e35be984f5808b

powerpc/mm: Fix Multi hit ERAT cause by recent THP update


> 
>> Only side effect is that we mark the pmd
>> invalid early. This can result in us blocking access to the page a bit longer
>> if we race against a thp split.
> 
> Again, this doesn't tell me what is the problem and why do we care.

Primary motivation is code reduction.

   7 files changed, 35 insertions(+), 87 deletions(-)


-aneesh