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[23.128.96.18]) by mx.google.com with ESMTP id a8si1804852ilt.107.2021.06.23.20.45.18; Wed, 23 Jun 2021 20:45:30 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=hGxnyq2X; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230048AbhFXDqG (ORCPT + 99 others); Wed, 23 Jun 2021 23:46:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229822AbhFXDqF (ORCPT ); Wed, 23 Jun 2021 23:46:05 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9EC0EC061574; Wed, 23 Jun 2021 20:43:46 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id e33so3589652pgm.3; Wed, 23 Jun 2021 20:43:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Fwh833srj12QAX2haTEqWT0V0OlCa/leSx47S6U0FNE=; b=hGxnyq2XiX8H7w5esy1UtDOY5y32a+0A8lBcJDwanK1YH2UuuZcdJ+D6VykggYGIzt Mx8F6o3dxXLtxrEwFENljHNFiI97JyhNIhq9aFK5NC5qr9pPep1c0zmflW5UaTxXnrOo iEWH64hPZhu/c4qTuJ7sg85UupzGMZ6cwU/9ZPayY9zgPCRLWvoQXqyKPzbywMQ3sD+6 +a9NTOa+NtDaBQHvYM6hqIJf569nnMeEIhXKdQVZ76vC7WbLB9pI0Eeh64+CBZhX4kcs khumk8pQZ4NX6VwjXhQ9yel4I4NcLIkBF0MkOjRfNcgsOLRbp666M1VupC2XAbbm6/8N bjVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=Fwh833srj12QAX2haTEqWT0V0OlCa/leSx47S6U0FNE=; b=YBCz6UH3+1OTEm8TUD7QLyDH9Gr+k/JSb2UqgECX1GiCBGq05fPz86qyGR6VJ+xWOy durs4D6tqlchtQdEyRrcGtuzExzfBD3xrvk69yHTweUfLxWPQmfVHJ+9D5HUNrYE4DqB Ec2eV9uTngO6LgsokyyrCzphvsgYVWSI6vcTdhY7KcscVXNIIANPRy9Tr7hRf3iMziuD zsW5Vjyq5PbzwBOHXDOoUPzCKagQXeERfiyM7rjajAb5LQH6uiqza2F3L4r91ACeVYdL eBd6koLxGBN2cxId+KHwVZWhhXIn7vVCPp+cBE6MD2D4+Z4UwOoUedKFMqI/S6wQwYsV j8dw== X-Gm-Message-State: AOAM530zRO6qcUDCLnJ1HoGK4n/cfBKhc4tZm9y0LMyCv5jibGdrktzZ UdmmCbJqN4ENFioKmMVSesqfBe3Z4G0= X-Received: by 2002:a05:6a00:1acd:b029:2fb:81a4:b06 with SMTP id f13-20020a056a001acdb02902fb81a40b06mr2907867pfv.36.1624506226222; Wed, 23 Jun 2021 20:43:46 -0700 (PDT) Received: from hoboy.vegasvil.org ([2601:645:c000:35:e2d5:5eff:fea5:802f]) by smtp.gmail.com with ESMTPSA id 11sm1103686pfh.182.2021.06.23.20.43.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jun 2021 20:43:45 -0700 (PDT) Date: Wed, 23 Jun 2021 20:43:43 -0700 From: Richard Cochran To: min.li.xe@renesas.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net 2/2] ptp: idt82p33: implement double dco time correction Message-ID: <20210624034343.GB6853@hoboy.vegasvil.org> References: <1624459585-31233-1-git-send-email-min.li.xe@renesas.com> <1624459585-31233-2-git-send-email-min.li.xe@renesas.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1624459585-31233-2-git-send-email-min.li.xe@renesas.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 23, 2021 at 10:46:25AM -0400, min.li.xe@renesas.com wrote: > +static int idt82p33_start_ddco(struct idt82p33_channel *channel, s32 delta_ns) > +{ > + s32 current_ppm = channel->current_freq; > + u32 duration_ms = MSEC_PER_SEC; What happens if user space makes a new adjustment before this completes? After all, some PTP profiles update the clock several times per second. Thanks, Richard