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 E2509C433EF for ; Thu, 23 Jun 2022 17:16:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231825AbiFWRQd (ORCPT ); Thu, 23 Jun 2022 13:16:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233296AbiFWRMo (ORCPT ); Thu, 23 Jun 2022 13:12:44 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11F5F4BFEC; Thu, 23 Jun 2022 09:58:35 -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 B3FEEB8248C; Thu, 23 Jun 2022 16:58:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DA5AC3411B; Thu, 23 Jun 2022 16:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656003512; bh=cHya7HynFnkggTlEZbyE6ZWrxenAhIKzXBwyjYNPLkA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wH5F2ITvvf8boKtJB8sE/ZrEtWk00iktBXY8xas5/G47dtVAaWgQPOdDOw4hrQ41d /s+AJnTh5KzRIOQsn+Xu1gY2dugCNPBwoNExm/n6RAJ6bD1k/myKcQVy/pVsPYs/S9 cNBOHFWLNBNdeoY+ARDOjVcjnBlIyD9meZqJi9Cc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dominik Brodowski , "Jason A. Donenfeld" Subject: [PATCH 4.9 222/264] random: avoid checking crng_ready() twice in random_init() Date: Thu, 23 Jun 2022 18:43:35 +0200 Message-Id: <20220623164350.359718044@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220623164344.053938039@linuxfoundation.org> References: <20220623164344.053938039@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 9b29b6b20376ab64e1b043df6301d8a92378e631 upstream. The current flow expands to: if (crng_ready()) ... else if (...) if (!crng_ready()) ... The second crng_ready() call is redundant, but can't so easily be optimized out by the compiler. This commit simplifies that to: if (crng_ready() ... else if (...) ... Fixes: 560181c27b58 ("random: move initialization functions out of hot pages") Cc: stable@vger.kernel.org Cc: Dominik Brodowski Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -835,7 +835,7 @@ int __init random_init(const char *comma if (crng_ready()) crng_reseed(); else if (trust_cpu) - credit_init_bits(arch_bytes * 8); + _credit_init_bits(arch_bytes * 8); return 0; }