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 320B1C433F5 for ; Fri, 27 May 2022 12:04:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352460AbiE0MDo (ORCPT ); Fri, 27 May 2022 08:03:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352481AbiE0LzY (ORCPT ); Fri, 27 May 2022 07:55:24 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 103FF14AF73; Fri, 27 May 2022 04:48:34 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 74CB5B824D6; Fri, 27 May 2022 11:48:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB607C34100; Fri, 27 May 2022 11:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1653652112; bh=vtFNrDwG4XkEmWxVaHM5wkzf3qnqfc1b2p90edXAux0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PLoL+GbSBJfvSZ6lTsl3XFrkWiFGkkjyFTeAYr30a8KUSBcSjlv2mrGR9pdE2gGe4 3Uu3Iv8yB4UDvHZHBkzzGjIWuE2V3eOi2js1pJg7QWUySgy8OlWjeyPtVrDgzNTT9H hST2mT1FMGhbOLuhEDmRjiQ43rbkHV8kIvyCWMKU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Biggers , Dominik Brodowski , "Jason A. Donenfeld" Subject: [PATCH 5.15 074/145] random: do not take pool spinlock at boot Date: Fri, 27 May 2022 10:49:35 +0200 Message-Id: <20220527084859.513239128@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220527084850.364560116@linuxfoundation.org> References: <20220527084850.364560116@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Jason A. Donenfeld" commit afba0b80b977b2a8f16234f2acd982f82710ba33 upstream. Since rand_initialize() is run while interrupts are still off and nothing else is running, we don't need to repeatedly take and release the pool spinlock, especially in the RDSEED loop. Reviewed-by: Eric Biggers Reviewed-by: Dominik Brodowski Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- drivers/char/random.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -978,10 +978,10 @@ int __init rand_initialize(void) rv = random_get_entropy(); arch_init = false; } - mix_pool_bytes(&rv, sizeof(rv)); + _mix_pool_bytes(&rv, sizeof(rv)); } - mix_pool_bytes(&now, sizeof(now)); - mix_pool_bytes(utsname(), sizeof(*(utsname()))); + _mix_pool_bytes(&now, sizeof(now)); + _mix_pool_bytes(utsname(), sizeof(*(utsname()))); extract_entropy(base_crng.key, sizeof(base_crng.key)); ++base_crng.generation;