[Patch v4 0/2] mm_slot: fix the usage of mm_slot_entry()

[Wei Yang <richard.weiyang@gmail.com>]

The usage of mm_slot_entry() in ksm/khugepaged is not correct. In case
mm_slot_lookup() return a NULL slot, mm_slot_entry() should not be called.

To fix this:

Patch 1: check slot before continue in ksm.c
Patch 2: remove the definition of khugepaged_mm_slot

v4:
  * adjust change log
  * use invert style in patch 1
  * rename slab to "mm_slot"

v3:
  fix a pf because of slot change
  fix uninitialized mm_slot

v2:
  fix the error in code instead guard by compiler

V1:
  add a BUILD_BUG_ON_MSG() to make sure slot is the first element

[1]: https://lkml.kernel.org/r/20250914000026.17986-1-richard.weiyang@gmail.com
[2]: https://lkml.kernel.org/r/20250919071244.17020-1-richard.weiyang@gmail.com
[3]: https://lkml.kernel.org/r/20250924004854.29889-1-richard.weiyang@gmail.com

Wei Yang (2):
  mm/ksm: don't call mm_slot_entry() when the slot is NULL
  mm/khugepaged: remove definition of struct khugepaged_mm_slot

 mm/khugepaged.c | 55 ++++++++++++++++---------------------------------
 mm/ksm.c        | 23 ++++++++++++---------
 2 files changed, 31 insertions(+), 47 deletions(-)

-- 
2.34.1