[PATCH] mm, hugetlb: Avoid double clearing for hugetlb pages

[David Hildenbrand]

On 22.10.20 10:55, Michal Hocko wrote:
> On Thu 22-10-20 10:04:50, David Hildenbrand wrote:
> [...]
>>> None of that would address the original point of this thread, the global
>>> init_on_alloc parameter.
>>
>> Yes, but I guess we're past that: whatever leaves the buddy shall be
>> zeroed out. That's the whole point of that security hardening mechanism.
> 
> Hugetlb can control its zeroying behavior via mount option (for
> MAP_HUGETLB controled by a command line parameter). If the page fault
> handler can recognize the pre-initialized pages then both init_on* can

Right, looking at init_on_alloc tells you if you have to zero after
alloc or if it's already been done even though you didn't pass GFP_ZERO.

-- 
Thanks,

David / dhildenb