netdev - Re: [PATCH net-next 5/5] bpf: split state from prandom

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Message-ID: <56154A84.5020206@plumgrid.com>
Date:	Wed, 7 Oct 2015 09:38:28 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
Cc:	hannes@...essinduktion.org, netdev@...r.kernel.org,
	Chema Gonzalez <chema@...gle.com>
Subject: Re: [PATCH net-next 5/5] bpf: split state from prandom_u32() and
 consolidate {c,e}BPF prngs

On 10/7/15 6:43 AM, Daniel Borkmann wrote:
> +void bpf_user_rnd_init_once(void)
> +{
> +	prandom_init_once(&bpf_user_rnd_state);
> +}

here the helper is definitely needed, since it's called from two
places and we must make sure that prandom_init_once doesn't
duplicate its static_key in two places.
Probably makes sense to add a comment to do_once api that

do_once(func, arg);
do_once(func, arg);

is not equal to

void my_helper(void) { do_once(func, arg); }
my_helper();
my_helper();

For this patch:
Acked-by: Alexei Starovoitov <ast@...mgrid.com>

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