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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 744A9C4332F for ; Wed, 12 Oct 2022 19:17:57 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Mnj8z3rmwz3dwZ for ; Thu, 13 Oct 2022 06:17:55 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.helo=relay.hostedemail.com (client-ip=216.40.44.15; helo=relay.hostedemail.com; envelope-from=joe@perches.com; receiver=) Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Mnj8K5Dgzz3bm9 for ; Thu, 13 Oct 2022 06:17:19 +1100 (AEDT) Received: from omf12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 2096E1C6C41; Wed, 12 Oct 2022 19:17:09 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: joe@perches.com) by omf12.hostedemail.com (Postfix) with ESMTPA id AB9FC17; Wed, 12 Oct 2022 19:16:43 +0000 (UTC) Message-ID: Subject: Re: [PATCH v1 3/5] treewide: use get_random_u32() when possible From: Joe Perches To: "Jason A. Donenfeld" , linux-kernel@vger.kernel.org Date: Wed, 12 Oct 2022 12:16:53 -0700 In-Reply-To: <20221005214844.2699-4-Jason@zx2c4.com> References: <20221005214844.2699-1-Jason@zx2c4.com> <20221005214844.2699-4-Jason@zx2c4.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.4 (3.44.4-2.fc36) MIME-Version: 1.0 X-Stat-Signature: c3d78nppyrywoyngway5d943fw3wwtdu X-Rspamd-Server: rspamout03 X-Rspamd-Queue-Id: AB9FC17 X-Session-Marker: 6A6F6540706572636865732E636F6D X-Session-ID: U2FsdGVkX1/Qw27OeRP8/mQW0Su38d7rwhSo1NO9QCw= X-HE-Tag: 1665602203-428634 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-wireless@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, linux-sctp@vger.kernel.org, target-devel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, drbd-dev@lists.linbit.com, dev@openvswitch.org, rds-devel@oss.oracle.com, linux-scsi@vger.kernel.org, dccp@vger.kernel.org, linux-rdma@vger.kernel.org, kasan-dev@googlegroups.com, lvs-devel@vger.kernel.org, SHA-cyfmac-dev-list@infineon.com, coreteam@netfilter.org, tipc-discussion@lists.sourceforge.net, linux-ext4@vger.kernel.org, linux-media@vger.kernel.org, linux-actions@lists.infradead.org, linux-nfs@vger.kernel.org, linux-block@vger.kernel.org, dmaengine@vger.kernel.org, linux-nvme@lists.infradead.org, linux-hams@vger.kernel.org, ceph-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, cake@lists.bufferbloat.net, brcm80211-dev-list.pdl@broadcom.com, linux-raid@vger.kernel.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-mmc@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, 2022-10-05 at 23:48 +0200, Jason A. Donenfeld wrote: > The prandom_u32() function has been a deprecated inline wrapper around > get_random_u32() for several releases now, and compiles down to the > exact same code. Replace the deprecated wrapper with a direct call to > the real function. [] > diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxg= b4/cm.c [] > @@ -734,7 +734,7 @@ static int send_connect(struct c4iw_ep *ep) > &ep->com.remote_addr; > int ret; > enum chip_type adapter_type =3D ep->com.dev->rdev.lldi.adapter_type; > - u32 isn =3D (prandom_u32() & ~7UL) - 1; > + u32 isn =3D (get_random_u32() & ~7UL) - 1; trivia: There are somewhat odd size mismatches here. I had to think a tiny bit if random() returned a value from 0 to 7 and was promoted to a 64 bit value then truncated to 32 bit. Perhaps these would be clearer as ~7U and not ~7UL > struct net_device *netdev; > u64 params; > =20 > @@ -2469,7 +2469,7 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_= buff *skb, > } > =20 > if (!is_t4(adapter_type)) { > - u32 isn =3D (prandom_u32() & ~7UL) - 1; > + u32 isn =3D (get_random_u32() & ~7UL) - 1; etc... drivers/infiniband/hw/cxgb4/cm.c: u32 isn =3D (prandom_u32() & ~7UL) - 1; drivers/infiniband/hw/cxgb4/cm.c: u32 isn =3D (prandom_u32() & ~7UL) - 1; drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c: rpl5->iss =3D = cpu_to_be32((prandom_u32() & ~7UL) - 1); drivers/scsi/cxgbi/cxgb4i/cxgb4i.c: u32 isn =3D (prandom_u32() & ~7UL) - 1= ; drivers/scsi/cxgbi/cxgb4i/cxgb4i.c: u32 isn =3D (prandom_u32() & ~7UL) - 1= ; drivers/target/iscsi/cxgbit/cxgbit_cm.c: rpl5->iss =3D cpu_to_be32((prandom= _u32() & ~7UL) - 1);