Re: [PATCH v2] kasan: fix cache shrink race with CPU hotplug

[Hui Su <sh_def@163.com>]

Thanks Andrew,

On Sat, Aug 08, 2026 at 12:39:21AM -0700, Andrew Morton wrote:
> AI review suggests that there's a pre-existing quarantine_size
> accounting flaw later in this function:
>
> 	https://sashiko.dev/#/patchset/20260808031459.3032812-1-sh_def@163.com
>
> If true, I'm surprised this hasn't yet been reported.

I'll take a closer look at this. If it turns out to be a real issue,
I'll send a separate patch since it's pre-existing and unrelated to the
hotplug race fix.

> Also, I'd like to see a need_resched() wrapping that expensive
>
> 		/* Scanning whole quarantine can take a while. */
> 		raw_spin_unlock_irqrestore(&quarantine_lock, flags);
> 		cond_resched();
> 		raw_spin_lock_irqsave(&quarantine_lock, flags);

Good point, that makes sense. Would you prefer that I fold this into a
v3 of this patch, or send it as a separate follow-up patch?

Thanks,
Hui