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SubjectRe: [PATCH v7] ath9k: let sleep be interrupted when unregistering hwrng
Hmm, set_notify_signal() calls wake_up_state() in kernel/sched/core.c, which
is not currently exported. Only by including EXPORT_SYMBOL(wake_up_state) and
rebuilding vmlinux was I able to build rng-core.ko and load it successfully.

That said, this patch allows 'ip link set wlan0 down' to wake a blocked process
reading from /dev/hwrng, eliminating the delay as described. I'll give my
sign-off with the EXPORT_SYMBOL sorted out.

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