From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-6.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 2C5D57D2EF for ; Sun, 30 Jun 2019 04:08:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725613AbfF3EIc (ORCPT ); Sun, 30 Jun 2019 00:08:32 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:42682 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725771AbfF3EIc (ORCPT ); Sun, 30 Jun 2019 00:08:32 -0400 Received: by mail-pf1-f195.google.com with SMTP id q10so4887151pff.9 for ; Sat, 29 Jun 2019 21:08:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=e0I5Wbh2bYaS07xL/I5DH0yq5CBaIl3bDJRvSpz3Cxw=; b=xqjA+u5Ad+vYKVP92a2BTpYUrFDekp/y9vVawsHEjKO7Fg/cSWp1lmsDpDMvwGVdoZ jEeR5kHt6l8rIa0BkmkyGwfIKCqldBKhSBfuGhL350FprtHOurblD5rzXm37Qck3Sk8V Wr6vunL4r9CLygaJMBdavGShvFfFhFmNjKFp1GYQoIYJyl3r/drB2GnTWcKHZPchmUZq +6CPynCiTMXQU0yldwM+CljanzIZFTyD9Ghcs7KT8BMj/w5TPFOOFX0c9s6WNnRLO9lw fzlM8mvdgWjRNcNB/aH7BKa2yDw6J7vMg98azPuC6dmAifTgiiVZfDwr0nN2Fc2cRxtW smWg== 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=e0I5Wbh2bYaS07xL/I5DH0yq5CBaIl3bDJRvSpz3Cxw=; b=iK0gHoRQgf89h0V6Oo9ep+ZgLzeLF0WQRwWT3p7Fyx/Vqbz1GvCoQiPllk+QG4hdcy jhVJjvSPOr1uZQUxfTLIyaVeVfr8DSlc74NNtxxs9+dm9kIaHix287kyr54P/RjTS4tO EjoOFYZhicNmCus1ddg9C4L/D3UUQOa7J8OSbsam8WWrHJvbAplqXtNsnRKQ1S0KOC93 4wUxBjir97ds484nHvGabQ5DoR4n3VEn6Oj9liPODgTGUKVo3670OQgd8KZIcviSmFGS uFklFz4aDTR+pPlJOjTQE7H1taYvSSua2PYR1yHbjyb1M4azcuGwJ0mTDbAff/9n6opq XtDA== X-Gm-Message-State: APjAAAWZMBswHFE+FBEiny41vONr7ngKOpobGhx2VnO6/XmubgE1nPB2 4NjUq+TES8hjmN1/Xr7+Laf3Sg== X-Google-Smtp-Source: APXvYqwD9XJaDKXnwWfO9ySpWpXXJiDmPxZa092n3DTTRMCGd5MlYCVT4ZXl4LKaiWHUyZ+RcuIYSQ== X-Received: by 2002:a63:1f47:: with SMTP id q7mr17628956pgm.264.1561867711398; Sat, 29 Jun 2019 21:08:31 -0700 (PDT) Received: from builder (104-188-17-28.lightspeed.sndgca.sbcglobal.net. [104.188.17.28]) by smtp.gmail.com with ESMTPSA id z11sm5832982pjn.2.2019.06.29.21.08.30 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 29 Jun 2019 21:08:30 -0700 (PDT) Date: Sat, 29 Jun 2019 21:08:28 -0700 From: Bjorn Andersson To: Fabien Dessenne Cc: Ohad Ben-Cohen , Jonathan Corbet , linux-remoteproc@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Gaignard , Alexandre Torgue Subject: Re: [PATCH 0/2] hwspinlock: add the 'in_atomic' API Message-ID: <20190630040828.GB1263@builder> References: <1551974303-24542-1-git-send-email-fabien.dessenne@st.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1551974303-24542-1-git-send-email-fabien.dessenne@st.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Thu 07 Mar 07:58 PST 2019, Fabien Dessenne wrote: > In its current implementation, the hwspinlock framework relies on jiffies > to handle the timeout of the hwspin_lock_timeout_xxx() API. > In an atomic context (or more precisely when irq are disabled) jiffies does not > increase, which prevents the timeout to reach its target value (infinite loop). > > Note that there is already an hwspinlock user that runs in atomic context > (drivers/irqchip/irq-stm32-exti.c) and that has to handle by itself the > timeout. > > The first patch of the series completes the Documentation (the 'raw' API > is not documented), and the second patch provides with the 'in_atomic' API. > Applied Thanks, Bjorn > Fabien Dessenne (2): > hwspinlock: document the hwspinlock 'raw' API > hwspinlock: add the 'in_atomic' API > > Documentation/hwspinlock.txt | 81 ++++++++++++++++++++++++++++++++++++ > drivers/hwspinlock/hwspinlock_core.c | 43 +++++++++++++------ > include/linux/hwspinlock.h | 61 +++++++++++++++++++++++++-- > 3 files changed, 169 insertions(+), 16 deletions(-) > > -- > 2.7.4 >