[PATCH 3/4] mwifiex: debugfs: use kzalloc() to allocate formatting buffers

[Francesco Dolcini]

+Jeff

Jeff: this is relevant also for nxpwifi.

On Wed, Jul 01, 2026 at 04:59:12PM +0300, Mike Rapoport (Microsoft) wrote:
> mwifiex debugfs functions allocate buffers for formatting debug output
> text using get_zeroed_page().
> 
> These buffers 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 at kernel.org>

Reviewed-by: Francesco Dolcini <francesco.dolcini at toradex.com>