Re: [PATCH v2] random: set fast pool count to zero in cpuhp teardown

[Sebastian Andrzej Siewior]

On 2022-02-14 15:42:50 [+0100], Jason A. Donenfeld wrote:
> Hi Sebastian,
Hi Jason,

> If we move this to startup, is there a phase during which no interrupt
> will arrive? That is, can this happen very very early in startup, so
> that zeroing out count happens *before* ++count?

Interrupts will arrive starting with CPUHP_AP_ONLINE_IDLE from the CPU
HP point of view. My suggestion had a check for upper most bit and only
clear count if that bit was seen. So we wouldn't clear the counter if we
wouldn't suspect one of the rare corner cases.

> Jason

Sebastian