linux-stable.git/mm/mlock.c, branch linux-6.3.y

mm: introduce vm_flags_reset_once to replace WRITE_ONCE vm_flags updates

2023-02-10T00:51:41+00:00

Provide vm_flags_reset_once() and replace the vm_flags updates which used
WRITE_ONCE() to prevent compiler optimizations.

Link: https://lkml.kernel.org/r/20230201000116.1333160-1-surenb@google.com
Fixes: 0cce31a0aa0e ("mm: replace vma->vm_flags direct modifications with modifier calls")
Signed-off-by: Suren Baghdasaryan 
Reported-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Acked-by: Michal Hocko 
Signed-off-by: Andrew Morton

mm: replace vma->vm_flags direct modifications with modifier calls

2023-02-10T00:51:39+00:00

Replace direct modifications to vma->vm_flags with calls to modifier
functions to be able to track flag changes and to keep vma locking
correctness.

[akpm@linux-foundation.org: fix drivers/misc/open-dice.c, per Hyeonggon Yoo]
Link: https://lkml.kernel.org/r/20230126193752.297968-5-surenb@google.com
Signed-off-by: Suren Baghdasaryan 
Acked-by: Michal Hocko 
Acked-by: Mel Gorman 
Acked-by: Mike Rapoport (IBM) 
Acked-by: Sebastian Reichel 
Reviewed-by: Liam R. Howlett 
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Andy Lutomirski 
Cc: Arjun Roy 
Cc: Axel Rasmussen 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Eric Dumazet 
Cc: Greg Thelen 
Cc: Hugh Dickins 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joel Fernandes 
Cc: Johannes Weiner 
Cc: Kent Overstreet 
Cc: Laurent Dufour 
Cc: Lorenzo Stoakes 
Cc: Matthew Wilcox 
Cc: Minchan Kim 
Cc: Paul E. McKenney 
Cc: Peter Oskolkov 
Cc: Peter Xu 
Cc: Peter Zijlstra 
Cc: Punit Agrawal 
Cc: Sebastian Andrzej Siewior 
Cc: Shakeel Butt 
Cc: Soheil Hassas Yeganeh 
Cc: Song Liu 
Cc: Vlastimil Babka 
Cc: Will Deacon 
Signed-off-by: Andrew Morton

mm: replace VM_LOCKED_CLEAR_MASK with VM_LOCKED_MASK

2023-02-10T00:51:39+00:00

To simplify the usage of VM_LOCKED_CLEAR_MASK in vm_flags_clear(), replace
it with VM_LOCKED_MASK bitmask and convert all users.

Link: https://lkml.kernel.org/r/20230126193752.297968-4-surenb@google.com
Signed-off-by: Suren Baghdasaryan 
Acked-by: Michal Hocko 
Acked-by: Mel Gorman 
Acked-by: Mike Rapoport (IBM) 
Reviewed-by: Davidlohr Bueso 
Cc: Andy Lutomirski 
Cc: Arjun Roy 
Cc: Axel Rasmussen 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: David Rientjes 
Cc: Eric Dumazet 
Cc: Greg Thelen 
Cc: Hugh Dickins 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joel Fernandes 
Cc: Johannes Weiner 
Cc: Kent Overstreet 
Cc: Laurent Dufour 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: Matthew Wilcox 
Cc: Minchan Kim 
Cc: Paul E. McKenney 
Cc: Peter Oskolkov 
Cc: Peter Xu 
Cc: Peter Zijlstra 
Cc: Punit Agrawal 
Cc: Sebastian Andrzej Siewior 
Cc: Sebastian Reichel 
Cc: Shakeel Butt 
Cc: Soheil Hassas Yeganeh 
Cc: Song Liu 
Cc: Vlastimil Babka 
Cc: Will Deacon 
Signed-off-by: Andrew Morton

mm: switch vma_merge(), split_vma(), and __split_vma to vma iterator

2023-02-10T00:51:35+00:00

Drop the vmi_* functions and transition all users to use the vma iterator
directly.

Link: https://lkml.kernel.org/r/20230120162650.984577-30-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Signed-off-by: Andrew Morton

mlock: convert mlock to vma iterator

2023-02-10T00:51:33+00:00

Use the vma iterator so that the iterator can be invalidated or updated to
avoid each caller doing so.

Link: https://lkml.kernel.org/r/20230120162650.984577-19-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Signed-off-by: Andrew Morton

mm: remove mlock_vma_page()

2023-02-03T06:33:20+00:00

All callers now have a folio and can call mlock_vma_folio().  Update the
documentation to refer to mlock_vma_folio().

Link: https://lkml.kernel.org/r/20230116192827.2146732-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Andrew Morton

mm: mlock: update the interface to use folios

2023-02-03T06:33:04+00:00

Update the mlock interface to accept folios rather than pages, bringing
the interface in line with the internal implementation.

munlock_vma_page() still requires a page_folio() conversion, however this
is consistent with the existent mlock_vma_page() implementation and a
product of rmap still dealing in pages rather than folios.

Link: https://lkml.kernel.org/r/cba12777c5544305014bc0cbec56bb4cc71477d8.1673526881.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes 
Acked-by: Vlastimil Babka 
Cc: Christian Brauner 
Cc: Geert Uytterhoeven 
Cc: Hugh Dickins 
Cc: Joel Fernandes (Google) 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Matthew Wilcox 
Cc: Mike Rapoport (IBM) 
Cc: William Kucharski 
Signed-off-by: Andrew Morton

mm: mlock: use folios and a folio batch internally

2023-02-03T06:33:04+00:00

This brings mlock in line with the folio batches declared in mm/swap.c and
makes the code more consistent across the two.

The existing mechanism for identifying which operation each folio in the
batch is undergoing is maintained, i.e.  using the lower 2 bits of the
struct folio address (previously struct page address).  This should
continue to function correctly as folios remain at least system
word-aligned.

All invocations of mlock() pass either a non-compound page or the head of
a THP-compound page and no tail pages need updating so this functionality
works with struct folios being used internally rather than struct pages.

In this patch the external interface is kept identical to before in order
to maintain separation between patches in the series, using a rather
awkward conversion from struct page to struct folio in relevant functions.

However, this maintenance of the existing interface is intended to be
temporary - the next patch in the series will update the interfaces to
accept folios directly.

Link: https://lkml.kernel.org/r/9f894d54d568773f4ed3cb0eef5f8932f62c95f4.1673526881.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes 
Acked-by: Vlastimil Babka 
Cc: Christian Brauner 
Cc: Geert Uytterhoeven 
Cc: Hugh Dickins 
Cc: Joel Fernandes (Google) 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Matthew Wilcox 
Cc: Mike Rapoport (IBM) 
Cc: William Kucharski 
Signed-off-by: Andrew Morton

mm/mlock: drop dead code in count_mm_mlocked_page_nr()

2022-09-27T02:46:27+00:00

The check for mm being null has never been needed since the only caller
has always passed in current->mm.  Remove the check from
count_mm_mlocked_page_nr().

Link: https://lkml.kernel.org/r/20220615174050.738523-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Suggested-by: Lukas Bulwahn 
Signed-off-by: Andrew Morton

mm/mlock: use vma iterator and maple state instead of vma linked list

2022-09-27T02:46:24+00:00

Handle overflow checking in count_mm_mlocked_page_nr() differently.

Link: https://lkml.kernel.org/r/20220906194824.2110408-58-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Liam R. Howlett 
Tested-by: Yu Zhao 
Cc: Catalin Marinas 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: Davidlohr Bueso 
Cc: SeongJae Park 
Cc: Sven Schnelle 
Cc: Vlastimil Babka 
Cc: Will Deacon 
Signed-off-by: Andrew Morton