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 <a...@plumgrid.com>

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