tools: testing: add additional vma_internal.h stubs

Patch series "fix error handling in mmap_region() and refactor", v3.

The mmap_region() function is somewhat terrifying, with spaghetti-like
control flow and numerous means by which issues can arise and incomplete
state, memory leaks and other unpleasantness can occur.

This series goes to great lengths to simplify how mmap_region() works and
to avoid unwinding errors late on in the process of setting up the VMA for
the new mapping, and equally avoids such operations occurring while the
VMA is in an inconsistent state.

This series builds on the previously submitted hotfix patches (see link to
v2 below) which addresses the most critical issues around mmap_region(),
and further works to improve mmap_region() complexity, stability, and
testability.

This series moves the code to mm/vma.c to render it userland testable,
refactors and simplifies it into smaller functions that are significantly
more readable.

It additionally avoids performing an attempt at a second merge mid-way
through allocating a new VMA, a dubious proposition at best and one that
is highly subject to subtle bugs.

Rather than do this, we simply note that we ought to retry the merge and
do this as a final step.


This patch (of 3):

Add some additional vma_internal.h stubs in preparation for
__mmap_region() being moved to mm/vma.c.  Without these the move would
result in the tests no longer compiling.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/74b27e159e261d2ac1fe66a130edad1d61fdc176.1729858176.git.lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions