Commits
Andrey Mirkin authored and Pavel Emelianov committed 89b051b2f69
[PATCH] don't mmap zero pages for /dev/zero in advance In current implementation mmap_zero() immedeately mmaps zero page to the whole /dev/zero vma and thus allocates/pollutes all pte's. This is actually not required and can be dangerous if vma is very big. For CPT we do not need such "optimization", as we can set vm_ops on this vma and return zero page on demand. Bug #91769