On Thu, 17 Dec 2020 11:53:06 +1100, Michael Ellerman wrote:

In commit 8150a153c013 ("powerpc/64s: Use early_mmu_has_feature() in
set_kuap()") we switched the KUAP code to use early_mmu_has_feature(),
to avoid a bug where we called set_kuap() before feature patching had
been done, leading to recursion and crashes.

That path, which called probe_kernel_read() from printk(), has since
been removed, see commit 2ac5a3bf7042 ("vsprintf: Do not break early
boot with probing addresses").

[...]

Applied to powerpc/next.

[1/1] powerpc/64s/kuap: Use mmu_has_feature()
      https://git.kernel.org/powerpc/c/7613f5a66becfd0e43a0f34de8518695888f5458

cheers