On 04/04/2016 09:31 AM, Michal Hocko wrote:
On Sat 02-04-16 21:17:31, Piotr Kwapulinski wrote:
Currently the mmap(MAP_FIXED) discards the overlapping part of the
existing VMA(s).
Introduce the new MAP_DONTUNMAP flag which forces the mmap to fail
with ENOMEM whenever the overlapping occurs and MAP_FIXED is set.
No existing mapping(s) is discarded.
You forgot to tell us what is the use case for this new flag.
Exactly. Also, returning ENOMEM is strange, EINVAL might be a better
match, otherwise how would you distinguish a "geunine" ENOMEM from
passing a wrong address?
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