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 37A92C43334 for ; Thu, 23 Jun 2022 18:09:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236068AbiFWSJB (ORCPT ); Thu, 23 Jun 2022 14:09:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236732AbiFWSIY (ORCPT ); Thu, 23 Jun 2022 14:08:24 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F9FFBB30B; Thu, 23 Jun 2022 10:19:45 -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 E0F59B824BE; Thu, 23 Jun 2022 17:19:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D390C3411B; Thu, 23 Jun 2022 17:19:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656004782; bh=oC7uE7Rw1Ghn9TivFSc7Wmcc7UL8WyT0zdSQsUCYZZo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wb0ig/BcK1bxulngqFxSLfWxxsUNX7QGR9ynXOq7PWEDAh+TWyBQXWmjlFt8LMFxM lWETJgTWvJboEBiN2rgn8Fu1OE9bkpUVmmwA2lHonGj9M4u60Fq9KIl9nqE0i+UOZZ LXEtv/NHsx81K9PXARs1hPaGwkd7Drg2HB7fYDUA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thomas Gleixner , Arnd Bergmann , Max Filippov , "Jason A. Donenfeld" Subject: [PATCH 4.19 148/234] xtensa: use fallback for random_get_entropy() instead of zero Date: Thu, 23 Jun 2022 18:43:35 +0200 Message-Id: <20220623164347.243600867@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220623164343.042598055@linuxfoundation.org> References: <20220623164343.042598055@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: stable@vger.kernel.org From: "Jason A. Donenfeld" commit e10e2f58030c5c211d49042a8c2a1b93d40b2ffb upstream. In the event that random_get_entropy() can't access a cycle counter or similar, falling back to returning 0 is really not the best we can do. Instead, at least calling random_get_entropy_fallback() would be preferable, because that always needs to return _something_, even falling back to jiffies eventually. It's not as though random_get_entropy_fallback() is super high precision or guaranteed to be entropic, but basically anything that's not zero all the time is better than returning zero all the time. This is accomplished by just including the asm-generic code like on other architectures, which means we can get rid of the empty stub function here. Cc: Thomas Gleixner Cc: Arnd Bergmann Acked-by: Max Filippov Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- arch/xtensa/include/asm/timex.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) --- a/arch/xtensa/include/asm/timex.h +++ b/arch/xtensa/include/asm/timex.h @@ -30,10 +30,6 @@ extern unsigned long ccount_freq; -typedef unsigned long long cycles_t; - -#define get_cycles() (0) - void local_timer_setup(unsigned cpu); /* @@ -69,4 +65,6 @@ static inline void set_linux_timer (unsi WSR_CCOMPARE(LINUX_TIMER, ccompare); } +#include + #endif /* _XTENSA_TIMEX_H */