[PATCH 0/4][Zesty SRU] Fix for LP #1674838

[Colin Ian King]

On 05/05/17 16:32, Seth Forshee wrote:
> BugLink: http://bugs.launchpad.net/bugs/1674838
> 
> Some of the Power9 enablement patches in zesty are triggering a BUG
> statement in migration_entry_to_page() for many users. The offending
> patches don't appear to be included for any functionality the provide
> but rather to make a later patch a clean cherry pick. The backport of
> that patch is not difficult, so this series reverts all three patches
> and then applies a backport of the last patch.
> 
> 
> Aneesh Kumar K.V (1):
>   mm/ksm: handle protnone saved writes when making page write protect
> 
> Seth Forshee (3):
>   Revert "mm/ksm: handle protnone saved writes when making page write
>     protect"
>   Revert "mm, ksm: convert write_protect_page() to use
>     page_vma_mapped_walk()"
>   Revert "mm: introduce page_vma_mapped_walk()"
> 
>  include/linux/rmap.h |  26 -------
>  mm/Makefile          |   6 +-
>  mm/huge_memory.c     |   9 +--
>  mm/ksm.c             |  36 +++++-----
>  mm/page_vma_mapped.c | 188 ---------------------------------------------------
>  5 files changed, 22 insertions(+), 243 deletions(-)
>  delete mode 100644 mm/page_vma_mapped.c
> 
> 
Thanks Seth,

Got some good test results with this and I also hammered this to death
with stress-ng yesterday, so I'm happy it addresses the issue.

Acked-by: Colin Ian King <colin.king at canonical.com>