[PATCH v4 0/4] Some cleanups for the KVA/vmalloc

[Uladzislau Rezki (Sony)]

Patch [1] removes an unused argument "node" from the __alloc_vmap_area()
function and that is it.

Patch [2] is not driven by any particular workload that fails or so,
it is just better approach to handle one specific split case.

Patch [3] some cleanups in merging path. Basically on a first step
the mergeable node is detached and there is no reason to "unlink" it.
The same concerns the second step unless it has been merged on first
one.

Patch [4] replaces BUG_ON() by WARN_ON() and moves it under "unlink" logic.
After [3] merging path "unlink" only linked nodes. Therefore we can say
that removing detached object is a bug in all cases.

v3->v4:
    - Replace BUG_ON by WARN_ON() in [4];
    - Update the commit message of the [4].

v2->v3:
    - remove the odd comment from the [3];

v1->v2:
    - update the commit message. [2] patch;
    - fix typos in comments. [2] patch;
    - do the "preload" for NUMA awareness. [2] patch;

Uladzislau Rezki (Sony) (4):
  mm/vmap: remove "node" argument
  mm/vmap: preload a CPU with one object for split purpose
  mm/vmap: get rid of one single unlink_va() when merge
  mm/vmap: switch to WARN_ON() and move it under unlink_va()

 mm/vmalloc.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 81 insertions(+), 18 deletions(-)

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2.11.0