IB/rdmavt: use kzalloc() to allocate QPN-map pages

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get_map_page() allocates bitmap pages using get_zeroed_page().

The bitmaps can be allocated with kmalloc() as there's nothing special
about them to go directly to the page allocator.

kmalloc() provides a better API that does not require ugly casts and
kfree() does not need to know the size of the freed object.

Performance difference between kmalloc() and __get_free_pages() is not
measurable as both allocators take an object/page from a per-CPU list for
fast path allocations.

For the slow path the performance is anyway determined by the amount of
reclaim involved rather than by what allocator is used.

Replace use of get_zeroed_page() with kzalloc() and free_page() with
kfree().

Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260713-b4-rdma-v2-5-65d2a1a5180c@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Mike Rapoport (Microsoft) 2026-07-13 10:17:26 +03:00 • committed by Leon Romanovsky

parent 45bf0b3da4

commit f8d04b0c74

1 changed files with 4 additions and 4 deletions

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drivers/infiniband/sw/rdmavt/qp.c

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