BACKPORT: FROMGIT: mm: handle faults that merely update the accessed bit under the VMA lock

Move FAULT_FLAG_VMA_LOCK check out of handle_pte_fault().  This should
have a significant performance improvement for mmaped files.  Write faults
(on read-only shared pages) still take the mmap lock as we do not want to
audit all the implementations of ->pfn_mkwrite() and ->page_mkwrite().
However write-faults on private mappings are handled under the VMA lock.

Link: https://lkml.kernel.org/r/20230724185410.1124082-11-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit 88e2667632d43928d3ed50d0163ecd73aaa2d455
https: //git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable)
[surenb: replaced folio_put() with put_page() in wp_page_shared()]

Bug: 293665307
Change-Id: I27ac40bb0f7347083f641e0cfc8ab33e182c4c5b
Signed-off-by: Suren Baghdasaryan <surenb@google.com>