[v2 PATCH 0/3] mm/mempolicy: some fix and semantics cleanup

[Feng Tang]

Hi All,

We've posted v4 patchset introducing a new "perfer-many" memory policy
https://lore.kernel.org/lkml/1615952410-36895-1-git-send-email-feng.tang@xxxxxxxxx/ ,
for which Michal Hocko gave many comments while pointing out some
problems, and we also found some semantics confusion about 'prefer'
and 'local' policy, as well as some duplicated code. This patchset
tries to address them. Please help to review, thanks!

The patchset has been run with some sanity test like 'stress-ng'
and 'ltp', and no problem found.

Thanks,
Feng

Changelogs:
    v2:
      * rename mempolicy_nodemask_intersects() to
        mempolicy_in_oom_domain() and correct commit log (Michal Hocko)
      * change the mpol syscall param sanity check (Michal Hocko) 
      * combine the 3/4 and 4/4 in v1 into one patch,
        and further clean the logic (Michal Hocko)

    v1:
      * use helper func instead of macro for patch 2/4 (David Rientjes)
      * fix a possible null pointer case in patch 3/4 		
      * update commit log for 1/4
      
    RFC v2:
      * add for oom check fix patch 1/4
      * add the unification patch for mpol preprocess 2/4

Feng Tang (3):
  mm/mempolicy: cleanup nodemask intersection check for oom
  mm/mempolicy: don't handle MPOL_LOCAL like a fake MPOL_PREFERRED
    policy
  mm/mempolicy: unify the parameter sanity check for mbind and
    set_mempolicy

 include/linux/mempolicy.h      |   2 +-
 include/uapi/linux/mempolicy.h |   1 -
 mm/mempolicy.c                 | 205 ++++++++++++++++++++---------------------
 mm/oom_kill.c                  |   2 +-
 4 files changed, 103 insertions(+), 107 deletions(-)

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2.7.4