[PATCH] powerpc/book3s: Remove a few page table update interfaces.

[Aneesh Kumar K.V]

On 2/19/19 11:23 AM, Nicholas Piggin wrote:
> Aneesh Kumar K.V's on February 14, 2019 4:45 pm:
>> When updating page tables, we need to make sure we fill the page table
>> entry valid bit. We should be using page table populate interface for
>> updating the table entries. The page table 'set' interface allows
>> updating the raw value of page table entry. This can result in
>> updating the entry wrongly. Remove the 'set' interface so that we avoid
>> its future usage.
> 
> Removing a pointless indirection is fine by me, but I can't
> figure out how this change could help to prevent entry being updated
> incorrectly.


I guess my commit message is confusing. What I meant is this avoid the 
usage of pgd/pud_set from other kernel code without updating the page 
table entry valid bits. The idea is to make pgd_populate as the only 
interface for update pgd entries.

-aneesh