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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AA67C433E0 for ; Sun, 2 Aug 2020 08:35:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06EFD20658 for ; Sun, 2 Aug 2020 08:35:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.b="sJFO8/dN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726086AbgHBIfE (ORCPT ); Sun, 2 Aug 2020 04:35:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725992AbgHBIfD (ORCPT ); Sun, 2 Aug 2020 04:35:03 -0400 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8071FC06174A for ; Sun, 2 Aug 2020 01:35:03 -0700 (PDT) Received: by mail-wr1-x442.google.com with SMTP id z18so27902748wrm.12 for ; Sun, 02 Aug 2020 01:35:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=nwR0cSDRK1MacipoHZSBkL1yx2DzBEYBuItL8wnBzYY=; b=sJFO8/dNG2dGuiR/gT54hMqO6QnQtqhcCLkM5HmWg/NVzNUCWmPXvt4Bd510UemOzm GN/QfXIpMzu/oAX81Bv7GBpyPrJk4vph5MByjFxysIGgsnBGEVAG5jkaX8f/LCNpOQNQ Vaw0z/czRYrMJOgIcPbhpJEsaLTaG8fop7KNF7PqAsJ3ho3gBkUk5x0d3uiyNe8swLTq 2Lz70pmXu5+HB+9aa20R6jZ6/ViVkuAtWZnlgM1y7CcrwwtPis639LaCxdLFIXC6q9Uk b/SZz3MPXR0A24BbjHVD82xsyKT4FUSxzlVWYOlgICNrOMThzAgEtmASAbNgnv4Ut4W+ VQpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=nwR0cSDRK1MacipoHZSBkL1yx2DzBEYBuItL8wnBzYY=; b=qXEWP8EUu3JH/bFiKElezeVohIQ1YOip4RXzh0Up61js7GJ1HSFA/bvWSFi+QcN02e VtsllAhgyAQqzzmoBRJTxS+8PjtcEHv+Y1kE2PjoYQEt0OqkY8AjEJSsIaue9NUVvbEG hN+bsEWzU8CAoSD6bKD7/dWpHOXMrsz74E0HJthdO9acqglO76NyNa8isJvkVwxjTnN7 qpuRBVf//fkIcs0vow1gc+7Fo1fCXlAe+uL9oZwLKJe5o/pVX1KsObdoUCGwovS519Nu gH64y5/FIRMdYKwDTptH8RuKVJQaTxOQrfW14VbPueV1hDQ9Zgobxrt/gC3yFswROSwn LGYw== X-Gm-Message-State: AOAM532NXOWbe42EiBCATaYNGbZBTOlNQVt/l/9rNr1KXn4zzPq2fggi zWAUYTErKnYiuKZNS18Z2yWn6QhMF18= X-Google-Smtp-Source: ABdhPJysVYxzaXR2wk/8PBfHv2MvKUCCN0LllR0j3hUk2LNHkM3/+4zmSNtDZppkp6vg4/90vF9krA== X-Received: by 2002:adf:bbca:: with SMTP id z10mr9899567wrg.425.1596357302104; Sun, 02 Aug 2020 01:35:02 -0700 (PDT) Received: from debian-brgl.home (lfbn-nic-1-68-20.w2-15.abo.wanadoo.fr. [2.15.159.20]) by smtp.gmail.com with ESMTPSA id d14sm19281466wre.44.2020.08.02.01.35.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Aug 2020 01:35:01 -0700 (PDT) From: Bartosz Golaszewski To: Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Michal Simek , Greg Kroah-Hartman , Guenter Roeck , Andy Shevchenko Cc: linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v6 0/3] devres: provide and use devm_krealloc() Date: Sun, 2 Aug 2020 10:34:55 +0200 Message-Id: <20200802083458.24323-1-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Bartosz Golaszewski Hi Greg, Andy, this is a reworked version of devm_krealloc(). This time without the risk of sleeping with spinlock taken. I noticed that devres_lock is only there to protect the integrity of the devres list - we can assume users are sane enough to not devm_kfree() chunks that they devm_krealloc() at the same time so we only take the lock when manipulating the list now. I dropped Andy's review tag due to this change. === Regular krealloc() obviously can't work with managed memory. This series implements devm_krealloc() and adds the first users with hope that this helper will be adopted by other drivers currently using non-managed krealloc(). Some additional changes to the code modified by main patches are included. v1 -> v2: - remove leftover call to hwmon_device_unregister() from pmbus_core.c - add a patch extending devm_kmalloc() to handle zero size case - use WARN_ON() instead of WARN_ONCE() in devm_krealloc() when passed a pointer to non-managed memory - correctly handle the case when devm_krealloc() is passed a pointer to memory in .rodata (potentially returned by devm_kstrdup_const()) - correctly handle ZERO_SIZE_PTR passed as the ptr argument in devm_krealloc() v2 -> v3: - drop already applied patches - collect Acks - add an additional user in iio v3 -> v4: - add the kerneldoc for devm_krealloc() - WARN() outside of spinlock - rename local variable v4 -> v5: - tweak the kerneldoc v5 -> v6: - tweak the devres_lock handling in devm_krealloc() Bartosz Golaszewski (3): devres: provide devm_krealloc() hwmon: pmbus: use more devres helpers iio: adc: xilinx-xadc: use devm_krealloc() .../driver-api/driver-model/devres.rst | 1 + drivers/base/devres.c | 65 +++++++++++++++++++ drivers/hwmon/pmbus/pmbus_core.c | 28 +++----- drivers/iio/adc/xilinx-xadc-core.c | 16 ++--- include/linux/device.h | 2 + 5 files changed, 85 insertions(+), 27 deletions(-) -- 2.26.1