Nicholas Piggin [off-list ref] writes:

On Thu, 28 Jul 2016 00:18:08 +1000
Michael Ellerman [off-list ref] wrote:

quoted

From: "Aneesh Kumar K.V" <redacted>

This switches early feature checks to use the non static key variant
of the function. In later patches we will be switching
cpu_has_feature() and mmu_has_feature() to use static keys and we can
use them only after static key/jump label is initialized. Any check
for feature before jump label init should be done using this new
helper.

Can't convince you to call it *_has_feature_early()?

Hmmm, I'll go with early_cpu_has_feature().

Otherwise it reads "does the CPU have feature 'early'".

Any point to a WARN_ON_ONCE() in these guys that trips if they are
used after the jump labels are set up?

See patch 20. Though we can't use WARN() as it may be too early in boot
to WARN(), so it just prints() and dumps stack.

cheers