{"id":810233,"url":"http://patchwork.ozlabs.org/api/1.2/patches/810233/?format=json","web_url":"http://patchwork.ozlabs.org/project/netdev/patch/1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com/","project":{"id":7,"url":"http://patchwork.ozlabs.org/api/1.2/projects/7/?format=json","name":"Linux network development","link_name":"netdev","list_id":"netdev.vger.kernel.org","list_email":"netdev@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com>","list_archive_url":null,"date":"2017-09-05T17:59:27","name":"radix-tree: must check __radix_tree_preload() return value","commit_ref":null,"pull_url":null,"state":"not-applicable","archived":true,"hash":"d5126e2d69147622bd2c91659ae01319678c9b36","submitter":{"id":2404,"url":"http://patchwork.ozlabs.org/api/1.2/people/2404/?format=json","name":"Eric Dumazet","email":"eric.dumazet@gmail.com"},"delegate":{"id":34,"url":"http://patchwork.ozlabs.org/api/1.2/users/34/?format=json","username":"davem","first_name":"David","last_name":"Miller","email":"davem@davemloft.net"},"mbox":"http://patchwork.ozlabs.org/project/netdev/patch/1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com/mbox/","series":[{"id":1619,"url":"http://patchwork.ozlabs.org/api/1.2/series/1619/?format=json","web_url":"http://patchwork.ozlabs.org/project/netdev/list/?series=1619","date":"2017-09-05T17:59:27","name":"radix-tree: must check __radix_tree_preload() return value","version":1,"mbox":"http://patchwork.ozlabs.org/series/1619/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/810233/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/810233/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"NBavwmqx\"; dkim-atps=neutral"],"Received":["from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xmvcc10DXz9s7g\n\tfor ;\n\tWed, 6 Sep 2017 03:59:44 +1000 (AEST)","(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1753251AbdIER7b (ORCPT );\n\tTue, 5 Sep 2017 13:59:31 -0400","from mail-pg0-f67.google.com ([74.125.83.67]:38457 \"EHLO\n\tmail-pg0-f67.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1752154AbdIER73 (ORCPT\n\t); Tue, 5 Sep 2017 13:59:29 -0400","by mail-pg0-f67.google.com with SMTP id t3so2314881pgt.5;\n\tTue, 05 Sep 2017 10:59:28 -0700 (PDT)","from ?IPv6:2620:15c:2c1:100:71d2:2db4:a10e:204e?\n\t([2620:15c:2c1:100:71d2:2db4:a10e:204e])\n\tby smtp.googlemail.com with ESMTPSA id\n\tt73sm2004578pgb.84.2017.09.05.10.59.27\n\t(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tTue, 05 Sep 2017 10:59:27 -0700 (PDT)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=gmail.com; s=20161025;\n\th=message-id:subject:from:to:cc:date:mime-version\n\t:content-transfer-encoding;\n\tbh=/pzOR9YmtmBH8Y/vQZi4hxGR4ZdctGNteTkff2p3lmE=;\n\tb=NBavwmqxb48oVNI+qncXUEGMWxhfNvVJKGGMGlEWcTjVlE0z5XoM9tMs0cVqPrPTSl\n\tQ4ZueXUR2/+3bIXxxsyJrGYEraeCFmZ2D8R8GHH8BJe6QfhV1L299GpFxTwYXNQQaTw1\n\tvNFKFECMkgUXsjnFQjgKn8C3lm32fXay+GptEKrpFCMgysFAuH1dhGXmNFuEvpGT2XuQ\n\tsskWn7SnZa6RkeHSCPR03Zl5ngcVSiIQrIo3P/7JBzLPTBzidE9V4CX4l3DAVopTgwZE\n\tZ4qT8gSs8LAm41rRgZTp5zf8KarYeGIzLc4EXQ0yGedW4wu8SkjK8JZxAKBcEeKfMJnZ\n\tI8rA==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:message-id:subject:from:to:cc:date:mime-version\n\t:content-transfer-encoding;\n\tbh=/pzOR9YmtmBH8Y/vQZi4hxGR4ZdctGNteTkff2p3lmE=;\n\tb=hLcI3tR+aYjs3L4IOF7Y+e3XFek/nPfBaGRm7FXSwoxmiXmGF8AKonqi6MASRWFwKx\n\tjVHVARipluiMCyQQLZhsI+RlyiRXCcMHRCslVfpxdgVTba7o+EH5CyDBXiDsH6PisRLH\n\tfMZZiK3zHAW7BQ6Lk1Sst2xqmwNiKvdhBBOUi5mDk+pqtZ95/GheTX38G6mMBhdmbNpE\n\tChIcQDvoQrW4QXPhNhXCSS9ILekX6oJV6hccWRY6mzdWpfuPh6oWpDDq4Y3ToQRA98Mg\n\th+SxjEresBX/OnMQ79CfYEY998BMNfa3Wu3yLZPK3k0VO/k9lo1bMNpVTtCTP2hkxnz+\n\tPjNg==","X-Gm-Message-State":"AHPjjUh8j0I920csKDg3JJOJWLq9nXVF5z5u+QxzLFgydncExuDZNqzZ\n\tC+LhRr9LxbbL1w==","X-Google-Smtp-Source":"ADKCNb5wIRO9/5sKGIpxrFCa+iklozwwVWSw3uzRvPeXu5kix0hIs8YvOMsmqdgFm0f+IxgCgHavmw==","X-Received":"by 10.98.82.74 with SMTP id g71mr4494253pfb.300.1504634368640;\n\tTue, 05 Sep 2017 10:59:28 -0700 (PDT)","Message-ID":"<1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com>","Subject":"[PATCH] radix-tree: must check __radix_tree_preload() return value","From":"Eric Dumazet ","To":"Matthew Wilcox ","Cc":"Matthew Wilcox ,\n\t\"Kirill A. Shutemov\" ,\n\tAndrew Morton ,\n\tnetdev ,\n\tLinus Torvalds ,\n\tlinux-kernel ","Date":"Tue, 05 Sep 2017 10:59:27 -0700","Content-Type":"text/plain; charset=\"UTF-8\"","X-Mailer":"Evolution 3.10.4-0ubuntu2 ","Mime-Version":"1.0","Content-Transfer-Encoding":"7bit","Sender":"netdev-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"netdev@vger.kernel.org"},"content":"From: Eric Dumazet \n\n__radix_tree_preload() only disables preemption if no error is returned.\n\nSo we really need to make sure callers always check the return value.\n\nidr_preload() contract is to always disable preemption, so we need\nto add a missing preempt_disable() if an error happened.\n\nSimilarly, ida_pre_get() only needs to call preempt_enable() in the\ncase no error happened.\n\nFixes: 0a835c4f090a (\"Reimplement IDR and IDA using the radix tree\")\nFixes: 7ad3d4d85c7a (\"ida: Move ida_bitmap to a percpu variable\")\nSigned-off-by: Eric Dumazet \nCc: [4.11+]\n---\n lib/radix-tree.c | 12 ++++++++----\n 1 file changed, 8 insertions(+), 4 deletions(-)","diff":"diff --git a/lib/radix-tree.c b/lib/radix-tree.c\nindex 3527eb364964..fac702039304 100644\n--- a/lib/radix-tree.c\n+++ b/lib/radix-tree.c\n@@ -463,7 +463,7 @@ radix_tree_node_free(struct radix_tree_node *node)\n * To make use of this facility, the radix tree must be initialised without\n * __GFP_DIRECT_RECLAIM being passed to INIT_RADIX_TREE().\n */\n-static int __radix_tree_preload(gfp_t gfp_mask, unsigned nr)\n+static __must_check int __radix_tree_preload(gfp_t gfp_mask, unsigned nr)\n {\n \tstruct radix_tree_preload *rtp;\n \tstruct radix_tree_node *node;\n@@ -2104,7 +2104,10 @@ EXPORT_SYMBOL(radix_tree_tagged);\n */\n void idr_preload(gfp_t gfp_mask)\n {\n-\t__radix_tree_preload(gfp_mask, IDR_PRELOAD_SIZE);\n+\tint ret = __radix_tree_preload(gfp_mask, IDR_PRELOAD_SIZE);\n+\n+\tif (ret)\n+\t\tpreempt_disable();\n }\n EXPORT_SYMBOL(idr_preload);\n \n@@ -2118,13 +2121,14 @@ EXPORT_SYMBOL(idr_preload);\n */\n int ida_pre_get(struct ida *ida, gfp_t gfp)\n {\n-\t__radix_tree_preload(gfp, IDA_PRELOAD_SIZE);\n+\tint ret = __radix_tree_preload(gfp, IDA_PRELOAD_SIZE);\n \t/*\n \t * The IDA API has no preload_end() equivalent. Instead,\n \t * ida_get_new() can return -EAGAIN, prompting the caller\n \t * to return to the ida_pre_get() step.\n \t */\n-\tpreempt_enable();\n+\tif (!ret)\n+\t\tpreempt_enable();\n \n \tif (!this_cpu_read(ida_bitmap)) {\n \t\tstruct ida_bitmap *bitmap = kmalloc(sizeof(*bitmap), gfp);\n","prefixes":[]}