[PATCH v2 0/5] mm/vmalloc.c: code cleanup and improvements

[Baoquan He <bhe@redhat.com>]

These were made from code inspection in mm/vmalloc.c.

v1->v2:
=======
- In patch 3:
  - made change to improve code according to Uladzislau's suggestion;
  - use WRITE_ONCE() to assign the value to vn->pool[i].len finally,
    according to Shivank's suggestion.
In patch 5:
  - add back the WARN_ON_ONCE() on returned value from va_clip()
    invocation, and also add back the code comment. These are pointed
    out by Uladzislau. 

- Add reviewers' tag from Uladzislau, Shivank and Vishal. And I only add
  Shivank's tag in patch 1, 2, 4 according to his comment because patch 3
  and 5 are changed in v2.

Baoquan He (5):
  mm/vmalloc.c: change purge_ndoes as local static variable
  mm/vmalloc.c: find the vmap of vmap_nodes in reverse order
  mm/vmalloc.c: optimize code in decay_va_pool_node() a little bit
  mm/vmalloc: optimize function vm_unmap_aliases()
  mm/vmalloc.c: return explicit error value in alloc_vmap_area()

 mm/vmalloc.c | 61 ++++++++++++++++++++++++----------------------------
 1 file changed, 28 insertions(+), 33 deletions(-)

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2.41.0