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Date: Mon, 14 Feb 2022 10:16:53 +0100 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: "Jason A. Donenfeld" <Jason@...c4.com> Cc: LKML <linux-kernel@...r.kernel.org>, Linux Crypto Mailing List <linux-crypto@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Theodore Ts'o <tytso@....edu>, Sultan Alsawaf <sultan@...neltoast.com>, Jonathan Neuschäfer <j.neuschaefer@....net>, Dominik Brodowski <linux@...inikbrodowski.net> Subject: Re: [PATCH v6] random: defer fast pool mixing to worker On 2022-02-13 18:37:33 [+0100], Jason A. Donenfeld wrote: > I started looking at this and came up with this draft with questions: > https://git.kernel.org/pub/scm/linux/kernel/git/crng/random.git/commit/?h=jd/no-irq-trylocks to | - Does anything anywhere call get_random_xx() before the worker has a | chance to run? Once you queue a work item I don't think that the scheduler needs to put it on the CPU right away. It may have already have other tasks waiting including some with a RT priority. Also, the lock is irqsave() so they can be users in an interrupt handler. I remember the original reason why I made it irqsave is because something did kmalloc() and SLUB somehow asked for random bits. > Some research remains... > > Jason Sebastian
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