On Thu, 22 Jun 2017, Ben Hutchings wrote: > Here's my attempt at a backport to 3.2. This is only tested on > x86_64 and I think I should introduce local variables for > vma_start_gap() in a few places. I had to cherry-pick commit > 09884964335e "mm: do not grow the stack vma just because of an overrun > on preceding vma" before this one (which was a clean cherry-pick). Both your speed and your stamina are much better than mine; and your patch belies your Sturgeon's law signature. I haven't got beyond the architectures yet in my parallel attempt, and you do appear to be doing everything right (but a local variable often welcome, yes). I'm giving up for the night, will contine tomorrow. The only discrepancy I notice so far is that I have arch/alpha/kernel/osf_sys.c arch/ia64/mm/hugetlbpage.c arch/sparc/kernel/sys_sparc_32.c in my list of changed files, but they're not in yours. Hugh