Johannes Berg [off-list ref] writes:

On Tue, 2018-07-24 at 09:49 -0700, Kees Cook wrote:

quoted

In preparing to remove all stack VLA usage from the kernel[1], this
removes the discouraged use of AHASH_REQUEST_ON_STACK in favor of
the smaller SHASH_DESC_ON_STACK by converting from ahash-wrapped-shash
to direct shash. By removing a layer of indirection this both improves
performance and reduces stack usage. The stack allocation will be made
a fixed size in a later patch to the crypto subsystem.

I think you sent this before - it should be in net-next now.

Yup, I see it in net-next:

d17504b16ea2 wireless/lib80211: Convert from ahash to shash

-- 
Kalle Valo