linux.git/tools/testing/vma, branch master

mm/vma: update create_init_stack_vma() to use vma_flags_t

2026-08-07T01:57:03+00:00

Replace use of the legacy vm_flags_t flags with vma_flags_t values in
create_init_stack_vma().

As part of this change we add VMA_STACK_EARLY and VMA_STACK_INCOMPLETE
vma_flags_t defines, and slightly rework create_init_stack_vma() for
clarity.

No functional change intended.

Link: https://lore.kernel.org/20260711-b4-vma-flags-mm-v2-9-0fa2357d5431@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Zi Yan 
Reviewed-by: Lance Yang 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Baolin Wang 
Cc: Barry Song 
Cc: Christian Brauner 
Cc: Dave Airlie 
Cc: David Hildenbrand 
Cc: Dev Jain 
Cc: Jani Nikula 
Cc: Jan Kara 
Cc: Jann Horn 
Cc: Mike Rapoport 
Cc: Muchun Song 
Cc: Nico Pache 
Cc: Oscar Salvador 
Cc: Pedro Falcato 
Cc: Suren Baghdasaryan 
Cc: Thomas Zimmermann 
Signed-off-by: Andrew Morton

mm: introduce vma_get_page_prot() and use it

2026-08-07T01:57:03+00:00

There's a large number of vm_get_page_prot(vma->vm_flags) invocations. 
Make life easier by introducing vma_get_page_prot() parameterised by the
VMA.

This also makes converting vm_get_page_prot() to vma_flags_t easier.

Also update the userland VMA tests to reflect the change.

No functional change intended.

Link: https://lore.kernel.org/20260711-b4-vma-flags-mm-v2-8-0fa2357d5431@kernel.org
Signed-off-by: Lorenzo Stoakes 
Acked-by: Zi Yan 
Acked-by: Jani Nikula  # for i915
Reviewed-by: Thomas Zimmermann 	[DRM]
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Baolin Wang 
Cc: Barry Song 
Cc: Christian Brauner 
Cc: Dave Airlie 
Cc: David Hildenbrand 
Cc: Dev Jain 
Cc: Jan Kara 
Cc: Jann Horn 
Cc: Lance Yang 
Cc: Mike Rapoport 
Cc: Muchun Song 
Cc: Nico Pache 
Cc: Oscar Salvador 
Cc: Pedro Falcato 
Cc: Suren Baghdasaryan 
Signed-off-by: Andrew Morton

mm/vma: rename vma_get_page_prot to vma_flags_to_page_prot

2026-08-07T01:57:02+00:00

Having vma_get_page_prot() refer to VMA flags and vma_set_page_prot()
refer to a VMA is confusing.

Rename vma_get_page_prot() to vma_flags_to_page_prot() to resolve this
confusion.

No functional change intended.

Link: https://lore.kernel.org/20260711-b4-vma-flags-mm-v2-7-0fa2357d5431@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Lance Yang 
Reviewed-by: Zi Yan 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Baolin Wang 
Cc: Barry Song 
Cc: Christian Brauner 
Cc: Dave Airlie 
Cc: David Hildenbrand 
Cc: Dev Jain 
Cc: Jani Nikula 
Cc: Jan Kara 
Cc: Jann Horn 
Cc: Mike Rapoport 
Cc: Muchun Song 
Cc: Nico Pache 
Cc: Oscar Salvador 
Cc: Pedro Falcato 
Cc: Suren Baghdasaryan 
Cc: Thomas Zimmermann 
Signed-off-by: Andrew Morton

tools/testing/vma: output compared expression on ASSERT_[EQ, NE]()

2026-08-05T02:19:04+00:00

Update the macros to output the compared values at hex for easier debugging
when test asserts fail.

We have to be careful not to re-evaluate expressions as they may have
side-effects. So update the code to take local copies and use these for
both the test and the debug output.

Also remove unused IS_SET() macro.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-33-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Gregory Price 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: Pedro Falcato 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Vlastimil Babka (SUSE) 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

tools/testing/vma: default VMA, mm flag bits to 64-bit

2026-08-05T02:19:04+00:00

With all of the sanitisers turned on, setting the VMA and mm flag bits
depth to 128 by default results in overly long build times.

Reduce this to 64 - we can always manipulate these later for testing of
larger bitmaps as needed.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-32-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Gregory Price 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: Pedro Falcato 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Vlastimil Babka (SUSE) 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

mm/vma: introduce and use vma_set_pgoff()

2026-08-05T02:19:03+00:00

In order to lay the foundation for work that permits us to track the
virtual page offset of MAP_PRIVATE file-backed mappings, we abstract the
assignment of vma->vm_pgoff to vma_set_pgoff().

We additionally add a lock check here using the newly introduced
vma_assert_can_modify(). This asserts the VMA write lock if the VMA is
attached.

We also assert that, if this is an anonymous VMA and unfaulted, that its
(virtual) page offset is equal to the page offset of the VMA's address.

We must be careful about MAP_PRIVATE-/dev/zero which violates fundamental
assumptions about anonymous memory, so we check for !vma->vm_file after
using vma_is_anonymous() which these mappings satisfy.

Additionally, we only perform the assert if CONFIG_MMU is defined, as nommu
does not set vma->vm_pgoff = addr >> PAGE_SHIFT. This isn't really relevant
to rmap as it has no anon rmap (nor needs it), but we must avoid it
asserting falsely.

All of this logic is kept in assert_sane_pgoff() to keep things clear.

In order to maintain correctness given this assert, we also update
__install_special_mapping() to invoke vma_set_range() after it's set
vma->vm_ops (which determine whether the VMA is anonymous or not).

We do not use vma_set_pgoff() in vm_area_init_from(), as at the point of
forking, we don't necessarily have correct locking state.

Updating vma_set_range() covers most cases, but in addition to this we also
update insert_vm_struct(), compat_set_vma_from_desc() and nommu callers.

We also update vma_add_pgoff() and vma_sub_pgoff() to use vma_set_pgoff().

While we're here, we drop a BUG_ON() and update insert_vm_struct()'s
comment to reflect the fact anonymous mappings can be added here.

Finally, we update the CONFIG_MMU, CONFIG_PER_VMA_LOCK defines in the VMA
userland tests so IS_ENABLED() will work correctly with them.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-29-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Pedro Falcato 
Reviewed-by: Gregory Price 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

mm/vma: update vma_shrink() to not pass start, pgoff parameters

2026-08-05T02:19:03+00:00

vma_shrink() is only used by relocate_vma_down() to shrink the tail of a
VMA. Therefore neither the start nor the pgoff parameters make any sense.

It seemed we were passing the pgoff parameter solely to satisfy
vma_set_range()'s requirement for pgoff being specified.

Since vma_set_range() is now isolated to vma.c, we can simply introduce
__vma_set_range() which sets only vma->vm_[start, end], and invoke this
instead, removing start and pgoff from vma_shrink() altogether.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-26-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Pedro Falcato 
Reviewed-by: Gregory Price 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

mm/vma: make vma_set_range() static, drop insert_vm_struct() decl

2026-08-05T02:19:02+00:00

With __install_special_mapping() moved to vma.c, vma_set_range() can be
made into a static function there and is now completely isolated from the
rest of mm.

While we're here, we can also remove the insert_vm_struct() declaration
from mm.h - the function is implemented in vma.c and already declared in
vma.h, and has no users outside of mm.

Also update the VMA userland tests to reflect this change.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-25-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Pedro Falcato 
Reviewed-by: Gregory Price 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

mm/vma: introduce vma_assert_can_modify()

2026-08-05T02:19:01+00:00

vma_assert_write_locked() and vma_assert_attached() are useful for their
own purposes, however VMA code absolutely does allow the modification of
non-write locked VMAs if they are at that point detached (i.e. unreachable
from anywhere).

It's therefore useful to be able to assert that a VMA is either
detached (modification doesn't matter) or write locked (you're explicitly
locked for modification).

Therefore introduce vma_assert_can_modify() for this purpose.

While we're here, make vma_is_attached() available generally - if
!CONFIG_PER_VMA_LOCK, then there's no sense in which a VMA is
detached (vma_mark_detached() is a noop), so have this default to true in
this case.

Also update VMA userland tests to reflect this change, correcting the
previously open-coded vma_assert_[attached,detached]() there.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-22-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Gregory Price 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: Pedro Falcato 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton

mm/vma: remove duplicative vma_pgoff_offset() helper

2026-08-05T02:19:01+00:00

This is doing what linear_page_index() does, so eliminate it and replace it
with linear_page_index().

Update the VMA userland tests to reflect this change.

No functional change intended.

Link: https://lore.kernel.org/20260710-b4-pre-scalable-cow-v2-20-2a5aa403d977@kernel.org
Signed-off-by: Lorenzo Stoakes 
Reviewed-by: Pedro Falcato 
Reviewed-by: Gregory Price 
Reviewed-by: Vlastimil Babka (SUSE) 
Cc: Ackerley Tng 
Cc: David Hildenbrand (Arm) 
Cc: Kai Huang 
Cc: Marek Szyprowski 
Cc: SJ Park 
Cc: Thomas Zimmermann 
Cc: Liam R. Howlett (Oracle) 
Cc: Zi Yan 
Signed-off-by: Andrew Morton