More fixes for v5

[melver]

• Changes to KFENCE_NUM_OBJECTS handling. FYI: Turns out actual max order is MAX_ORDER-1 (🤔). So in reality the max number of objects on e.g. x86 is only 511.

• New KASAN problems, because of using page_alloc.

• set_directmap{invalid,default}_noflush() does not work due to potential deadlock.

[ramosian-glider]

LGTM (sorry, couldn't log in from phone)

On Fri, Oct 9, 2020, 18:59 Marco Elver notifications@github.com wrote:

@melver https://github.com/melver requested your review on: #160 https://github.com/google/kasan/pull/160 kfence: Do not limit KFENCE_NUM_OBJECTS in Kconfig.

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