maple_tree: document erase and allocations better

During a discussion on the maple tree erase process and GFP flags, Jason
suggested there be an amendment to the documentation to clarify the
situation on allocations within the tree.

The added text is an attempt to better explain that the tree may allocate,
even when erasing, and provide some guidance on how to work around such
issues.

[akpm@linux-foundation.org: tweak mtree_erase() description, per Jason]
Link: https://lore.kernel.org/all/20260617180419.GA231643@ziepe.ca/
Link: https://lore.kernel.org/20260821192627.4085470-16-liam@infradead.org
Signed-off-by: Liam R. Howlett (Oracle) <liam@infradead.org>
Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Rik van Riel <riel@surriel.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: Chris Mason <clm@meta.com>
Cc: Chuck Lever <cel@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions