[LTP] [PATCH v2] mm/vma04: new testcase

[Caspar Z. <ca...@ca...>]

vma04: corner cases for mbind vma merge issue

There are several corner cases (documented in mm/mmap.c) for mbind
vma merge issue, which makes commit 8aacc9f550 slightly incorrect.
KOSAKI Motohiro made a patch for it (commit e26a511) and composed
a reproducer containing these corner cases. Now I backport it to
LTP.

Signed-off-by: Caspar Zhang <ca...@ca...>
---

 v1->v2: returns TCONF when ENOSYS returns in invoking mbind()

 runtest/mm                       |    1 +
 testcases/kernel/mem/vma/vma04.c |  339 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 340 insertions(+), 0 deletions(-)
 create mode 100644 testcases/kernel/mem/vma/vma04.c