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=-20.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,INCLUDES_PULL_REQUEST, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 00A16C43463 for ; Thu, 17 Sep 2020 20:45:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A644520872 for ; Thu, 17 Sep 2020 20:45:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600375519; bh=WKW4r2P8HqtCHeSx0tHRRMm9SixDm+s1CA6FjjjMsys=; h=Date:From:To:Cc:Subject:List-ID:From; b=b+rJuqrmtnCbb7oPOnB7YjugRGdlwPL8NZeLkOUg6APV4wa+L5Zr0Z4WiI35urqd7 ICVwrrpJfOZ6m+r6NgcSEjgGlNWLJlGST683sdMDUGWdaB4O69FdM4Jlw+GWYX+wxh ne9xvCZVl7KDkVOtCgwmhJzBYAMSdSPQVJX0FMWo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726636AbgIQUpS (ORCPT ); Thu, 17 Sep 2020 16:45:18 -0400 Received: from mail-vk1-f196.google.com ([209.85.221.196]:39064 "EHLO mail-vk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726180AbgIQUpR (ORCPT ); Thu, 17 Sep 2020 16:45:17 -0400 Received: by mail-vk1-f196.google.com with SMTP id m8so844847vka.6 for ; Thu, 17 Sep 2020 13:45:17 -0700 (PDT) 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:mime-version :content-disposition; bh=KOMGP0AY1AiXNwWcSEx/xdRLKkV1S0FOTpp6dxykL9Y=; b=s3sD8BIsC6AzJuGVDggDwQmTpmSovO5Z5YPsK1zsZrFUY7yZENZhFQeJ8nLMF5UfmW CrT8ZtRvt1I1/2Xzzd7D1XQjwnFi0Ulk70NZF/DDAoKRcxMyby9La+x8/VCIg8UdrcU+ cv/qG5l45u3iTjsQGxqUuKA+1AfXBcQ4su5xAmRdvht5e5pG1MgmhdR+AnkHSoXWCJ7V SquEZudRLkV9IQPTaFNQYlvB7IVHwN3sQNMIc3tyxskau5G+sXkvIwewR/k3qUaikqa3 Akx0Ckb4Ql5CuSlmkVft7Whh3QTPwD2RoEcn4DDmTGO7UP+3fqF7s94dG7GPXSRLGKAQ OFbg== X-Gm-Message-State: AOAM531MO9X6Y5aGhCqvBYwuatk8ZuWDUBvafoSGrcoGh+uEWWahlAjy JJ6xE5KXis0u1Szw0cZusn7kBDhfaCY= X-Google-Smtp-Source: ABdhPJwYAUf2rq4aE2OsG1ltzwEma/KF0vYji20g4gZxw4N3Gg5N0MH9ul1/KZQeXstl3K2RDpq18g== X-Received: by 2002:a1f:a3cc:: with SMTP id m195mr10343933vke.16.1600375516558; Thu, 17 Sep 2020 13:45:16 -0700 (PDT) Received: from google.com (239.145.196.35.bc.googleusercontent.com. [35.196.145.239]) by smtp.gmail.com with ESMTPSA id 23sm163372vkw.25.2020.09.17.13.45.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2020 13:45:15 -0700 (PDT) Date: Thu, 17 Sep 2020 20:45:14 +0000 From: Dennis Zhou To: Linus Torvalds Cc: Tejun Heo , Christoph Lameter , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [GIT PULL] percpu fix for v5.9-rc6 Message-ID: <20200917204514.GA2880159@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Linus, This is a fix for the first chunk size calculation where the variable length array incorrectly used # of longs instead of bytes of longs. This came in as a code fix and not a bug report, so I don't think it was widely problematic. I believe it worked out due to it being memblock memory and alignment requirements working in our favor. Thanks, Dennis The following changes since commit f75aef392f869018f78cfedf3c320a6b3fcfda6b: Linux 5.9-rc3 (2020-08-30 16:01:54 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git for-5.9-fixes for you to fetch changes up to b3b33d3c43bbe0177d70653f4e889c78cc37f097: percpu: fix first chunk size calculation for populated bitmap (2020-09-17 17:34:39 +0000) ---------------------------------------------------------------- Sunghyun Jin (1): percpu: fix first chunk size calculation for populated bitmap mm/percpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/percpu.c b/mm/percpu.c index f4709629e6de..1ed1a349eab8 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1316,7 +1316,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr, /* allocate chunk */ alloc_size = sizeof(struct pcpu_chunk) + - BITS_TO_LONGS(region_size >> PAGE_SHIFT); + BITS_TO_LONGS(region_size >> PAGE_SHIFT) * sizeof(unsigned long); chunk = memblock_alloc(alloc_size, SMP_CACHE_BYTES); if (!chunk) panic("%s: Failed to allocate %zu bytes\n", __func__,