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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 C3BF2C433DB for ; Wed, 17 Mar 2021 07:55:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3D20664F8F for ; Wed, 17 Mar 2021 07:55:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D20664F8F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C4C0B6B0070; Wed, 17 Mar 2021 03:54:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C22756B0071; Wed, 17 Mar 2021 03:54:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B12076B0073; Wed, 17 Mar 2021 03:54:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0177.hostedemail.com [216.40.44.177]) by kanga.kvack.org (Postfix) with ESMTP id 9A8906B0070 for ; Wed, 17 Mar 2021 03:54:59 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 56DFA52D5 for ; Wed, 17 Mar 2021 07:54:59 +0000 (UTC) X-FDA: 77928605118.05.6FEC126 Received: from out30-54.freemail.mail.aliyun.com (out30-54.freemail.mail.aliyun.com [115.124.30.54]) by imf03.hostedemail.com (Postfix) with ESMTP id 18841C0007C8 for ; Wed, 17 Mar 2021 07:54:57 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04400;MF=xlpang@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0USESt84_1615967693; Received: from localhost(mailfrom:xlpang@linux.alibaba.com fp:SMTPD_---0USESt84_1615967693) by smtp.aliyun-inc.com(127.0.0.1); Wed, 17 Mar 2021 15:54:53 +0800 From: Xunlei Pang To: Christoph Lameter , Christoph Lameter , Pekka Enberg , Vlastimil Babka , Roman Gushchin , Konstantin Khlebnikov , David Rientjes , Matthew Wilcox , Shu Ming , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Wen Yang , James Wang , Xunlei Pang Subject: [PATCH v4 2/3] percpu: Export per_cpu_sum() Date: Wed, 17 Mar 2021 15:54:51 +0800 Message-Id: <1615967692-80524-3-git-send-email-xlpang@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1615967692-80524-1-git-send-email-xlpang@linux.alibaba.com> References: <1615967692-80524-1-git-send-email-xlpang@linux.alibaba.com> X-Stat-Signature: d8rf9bqfxy6zcxc187h8emkxwwikjfq8 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 18841C0007C8 Received-SPF: none (linux.alibaba.com>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=out30-54.freemail.mail.aliyun.com; client-ip=115.124.30.54 X-HE-DKIM-Result: none/none X-HE-Tag: 1615967697-999725 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: per_cpu_sum() is useful, and deserves to be exported. Tested-by: James Wang Signed-off-by: Xunlei Pang --- include/linux/percpu-defs.h | 10 ++++++++++ kernel/locking/percpu-rwsem.c | 10 ---------- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h index dff7040..0e71b68 100644 --- a/include/linux/percpu-defs.h +++ b/include/linux/percpu-defs.h @@ -220,6 +220,16 @@ (void)__vpp_verify; \ } while (0) +#define per_cpu_sum(var) \ +({ \ + typeof(var) __sum = 0; \ + int cpu; \ + compiletime_assert_atomic_type(__sum); \ + for_each_possible_cpu(cpu) \ + __sum += per_cpu(var, cpu); \ + __sum; \ +}) + #ifdef CONFIG_SMP /* diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c index 70a32a5..0980e51 100644 --- a/kernel/locking/percpu-rwsem.c +++ b/kernel/locking/percpu-rwsem.c @@ -178,16 +178,6 @@ bool __percpu_down_read(struct percpu_rw_semaphore *sem, bool try) } EXPORT_SYMBOL_GPL(__percpu_down_read); -#define per_cpu_sum(var) \ -({ \ - typeof(var) __sum = 0; \ - int cpu; \ - compiletime_assert_atomic_type(__sum); \ - for_each_possible_cpu(cpu) \ - __sum += per_cpu(var, cpu); \ - __sum; \ -}) - /* * Return true if the modular sum of the sem->read_count per-CPU variable is * zero. If this sum is zero, then it is stable due to the fact that if any -- 1.8.3.1