From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1914C433EF for ; Fri, 6 May 2022 07:59:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1389789AbiEFIC7 (ORCPT ); Fri, 6 May 2022 04:02:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1389792AbiEFIC6 (ORCPT ); Fri, 6 May 2022 04:02:58 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 671D567D1D; Fri, 6 May 2022 00:59:16 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1651823954; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=SPOE0gYWj9j1dUjvgP39Og9ua3b0mQKYArT3BeYIUVI=; b=255WrnOczyR8EQwEk84iFJCj7oJ4quj5izYkLwsSq66vyRivpLwlq/pzCLKdSma1xzKEzh LNdM83Cwb2R36TqLk3wXJygrGjsD9Dgs+XpP5gAXFp0gDfQLYp8if4ybJG89BIE1UzhfaY XH3R8Rz0YYqdGVfivs86USKPOop6pSfFUQWEpVF/wGdAih70WGXSRLaEWsn68XKdReifig UZp1vw0ODYvXvzx9BgK90PQ2XnWbcpf5n2EqOZZQD1kDcQc8AA9AAEr1Wb0DYYVrQZjZ0h GDe+ZTOnoCi6DViTIX0SGN5dQhSsspMkMMEADk4lUutXu/21TeFf8URptclHZg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1651823954; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=SPOE0gYWj9j1dUjvgP39Og9ua3b0mQKYArT3BeYIUVI=; b=pevZyCpSMuLeLpDdi23KVJ4rQtQaXyYYUTbDx6+vxW8a/19C9mM8QlRtryJ71e/4Bqt67m 2tO7cvcCscS9otDw== To: kernel test robot , "Jason A. Donenfeld" Cc: 0day robot , Arnd Bergmann , Theodore Ts'o , LKML , lkp@lists.01.org, linux-crypto@vger.kernel.org, nathan@kernel.org, "Jason A. Donenfeld" Subject: Re: [timekeeping] 3aeaac747d: PANIC:early_exception In-Reply-To: <20220506032023.GA23061@xsang-OptiPlex-9020> References: <20220506032023.GA23061@xsang-OptiPlex-9020> Date: Fri, 06 May 2022 09:59:13 +0200 Message-ID: <8735hnhz1q.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On Fri, May 06 2022 at 11:20, kernel test robot wrote: > PANIC: early exception 0x0d IP 10:ffffffff812cef11 error 0 cr2 0xffff888004a3aff8 > [ 0.000000][ T0] add_device_randomness (kbuild/src/rand-3/drivers/char/random.c:1028) > [ 0.000000][ T0] ? dmi_walk_early (kbuild/src/rand-3/drivers/firmware/dmi_scan.c:470) > [ 0.000000][ T0] dmi_walk_early (kbuild/src/rand-3/drivers/firmware/dmi_scan.c:151) > [ 0.000000][ T0] dmi_present (kbuild/src/rand-3/drivers/firmware/dmi_scan.c:605) Duh. So this wants to be: --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -2380,6 +2381,20 @@ static int timekeeping_validate_timex(co return 0; } +/** + * random_get_entropy_fallback - Returns the raw clock source value, + * used by random.c for platforms with no valid random_get_entropy(). + */ +unsigned long random_get_entropy_fallback(void) +{ + struct tk_read_base *tkr = &tk_core.timekeeper.tkr_mono; + struct clocksource *clock = READ_ONCE(tkr->clock); + + if (!timekeeping_suspended && clock) + return clock->read(clock); + return 0; +} +EXPORT_SYMBOL_GPL(random_get_entropy_fallback); /** * do_adjtimex() - Accessor function to NTP __do_adjtimex function