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Date: Wed, 25 Sep 2013 05:06:50 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Hannes Frederic Sowa <hannes@...essinduktion.org> Cc: Tom Herbert <therbert@...gle.com>, davem@...emloft.net, netdev@...r.kernel.org, jesse.brandeburg@...el.com, tytso@....edu, linux-kernel@...r.kernel.org Subject: Re: [PATCH RFC] random: introduce get_random_bytes_busy_wait_initialized On Wed, 2013-09-25 at 11:00 +0200, Hannes Frederic Sowa wrote: > /* > + * Busy loop until the nonblocking_pool is intialized and return > + * random data in buf of size nbytes. > + * > + * This is used by the network stack to defer the extraction of > + * entropy from the nonblocking_pool until the pool is initialized. > + * > + * We need to busy loop here, because we could be called from an > + * atomic section. > + */ > +void get_random_bytes_busy_wait_initialized(void *buf, int nbytes) > +{ > + while (!nonblocking_pool.initialized) > + cpu_relax(); > + get_random_bytes(buf, nbytes); > +} No idea if this can work if called from IRQ context. How is nonblocking_poll initialized if host has a single cpu ? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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