Re: [PATCH RFC bpf-next v2 02/10] bpf/helpers: introduce sleepable timers

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Just one comment on one of your FIXMEs:

> +	rcu_assign_pointer(t->sleepable_cb_fn, NULL);
> +	/* FIXME: probably do something about the SLEEPABLE flag */

I guess we should store the flag in the timer struct somewhere, and then
restrict the set_callback() functions so that the regular variant only
works without the flag set, and the _sleepable version only works if the
flag is set? Otherwise we may end up calling a non-sleepable function in
sleepable context or vise versa...

-Toke





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