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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CF449F44850 for ; Fri, 10 Apr 2026 12:20:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=7Lj1aNml9xNTs4vJYi74RnqcLcp2m2BsrRjTAYhHjrw=; b=K/x1AsUK/7GecS ZSQxh9P2bSqNS6cv8QydT28sS53VYsuos279usw60oLNm8YmXhrPiigoMMZf4ZOn4p/lY1hV4rc4j LyXxBJwIXjzRNpDdGvsAuaOcbpObsZZE5fkwzOMyDjZJs2lKocm75EsxAiDdV36sBSpGeCi9Qdsw/ tdBk7jam4mbzRFwfvt3NS+gzDymPSNbyWBIJYmbi7xsFv57y5zHfOCjHych3db2IEBCBfwYu4V2Fq t6qp6sFxZhX8p8Lj6QCtHFM8VPggaNHCh358SAVKEBO2Igdr1AwhCjfzduY1z2ral+zxWwGSTxeS0 LeV38vD5Gl3mNoD9DvtQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wBAqO-0000000CB2S-0YkQ; Fri, 10 Apr 2026 12:20:16 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wBAqI-0000000CArl-2FPy; Fri, 10 Apr 2026 12:20:10 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id BC2056132F; Fri, 10 Apr 2026 12:20:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 97CA3C19425; Fri, 10 Apr 2026 12:20:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775823609; bh=UKj6WoZFsTQfNpLsa4hK9AJwWp/c6TyAgfAmmgBM2Aw=; h=Date:From:To:Cc:Subject:References:From; b=SEmycwX5s0//+gtSPktg47GJS+8sJlwAPsv65Bq7Wv5tg7uQL3Gpghd9FaOczcWIN ZQaCuA/qh+jNH/riNYpmVLmwYhqyjM2JbqnNtt1yhbGBg3HT7iCiqP6g94wS0wTPIA 99ougHo5Nu9h67SjSnTNqyHC+/lIAAGR6p7tHCAck6aAnXmlbTDue5R1sT+DZ/waOZ GXIvFpg3p1ueseORBf9eozHpgJ3jpkMWN+atB0UvtcxRk8vKXhCteFgdwrDai6rThh FHU0CtO/nkzQnAaFOlH62oLpy9zcH9gwc0II0cebCdnPQhGplJ3L9nz1drcdz9bKdB 3Oc5+96qoKgtw== Date: Fri, 10 Apr 2026 14:20:06 +0200 Message-ID: <20260410120318.929806643@kernel.org> User-Agent: quilt/0.68 From: Thomas Gleixner To: LKML Cc: Andrey Ryabinin , kasan-dev@googlegroups.com, Arnd Bergmann , x86@kernel.org, Lu Baolu , iommu@lists.linux.dev, Michael Grzeschik , netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Herbert Xu , linux-crypto@vger.kernel.org, Vlastimil Babka , linux-mm@kvack.org, David Woodhouse , Bernie Thompson , linux-fbdev@vger.kernel.org, "Theodore Tso" , linux-ext4@vger.kernel.org, Andrew Morton , Uladzislau Rezki , Marco Elver , Dmitry Vyukov , Thomas Sailer , linux-hams@vger.kernel.org, "Jason A. Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Huacai Chen , loongarch@lists.linux.dev, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Dinh Nguyen , Jonas Bonn , linux-openrisc@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , linux-riscv@lists.infradead.org, Heiko Carstens , linux-s390@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org Subject: [patch 20/38] kasan: sw_tags: Replace get_cycles() by random_get_entropy() References: <20260410120044.031381086@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Seeding the random state with get_cycles() is functionally equivalent on the architectures which provide get_cycles(), but it does not make sense semantically. Use random_get_entropy() instead, which is the proper interface. This is part of a larger effort to remove get_cycles() usage from non-architecture code. Signed-off-by: Thomas Gleixner Cc: Andrey Ryabinin Cc: kasan-dev@googlegroups.com --- mm/kasan/sw_tags.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -41,7 +41,7 @@ void __init kasan_init_sw_tags(void) int cpu; for_each_possible_cpu(cpu) - per_cpu(prng_state, cpu) = (u32)get_cycles(); + per_cpu(prng_state, cpu) = (u32)random_get_entropy(); kasan_init_tags(); kasan_enable();