mm: assert the mmap_lock is held in __anon_vma_prepare()

Patch series "Improve anon_vma scalability for anon VMAs".

We have a 3x throughput improvement reported by Intel's kernel test robot:
https://lore.kernel.org/all/[email protected]/

This is from delaying taking the mmap_lock for page faults until we
actually need the mmap_lock in order to assign an anon_vma to the vma.  It
cleans up the page fault path a little by making the anon fault handler
more similar to the file fault handler.


This patch (of 4):

Convert the comment into an assertion.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: Jann Horn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions