From nobody Tue Jun 23 17:22:38 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC568C433EF for ; Wed, 2 Mar 2022 01:14:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238422AbiCBBP0 (ORCPT ); Tue, 1 Mar 2022 20:15:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229771AbiCBBPZ (ORCPT ); Tue, 1 Mar 2022 20:15:25 -0500 Received: from mail-qk1-x72a.google.com (mail-qk1-x72a.google.com [IPv6:2607:f8b0:4864:20::72a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47E08457B9 for ; Tue, 1 Mar 2022 17:14:43 -0800 (PST) Received: by mail-qk1-x72a.google.com with SMTP id c7so108597qka.7 for ; Tue, 01 Mar 2022 17:14:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=T0TkFFWcgAksB0r/eiWpvcxH5MHjEqDfjobzCtyWnt4=; b=e5BlFQgu75oQLnkpJb4FsfUxJG+JyX/bm0JpdLwMDTpJB75rrgraCfEQeGrCast3B+ mzJkWKRtGPQYnkq7nN3TeOFq7QFm+o4UybKfiE4PsV+YtHxvYA0dV6ux8hBFOQ2tzmsi qnKjdxdWamUx5ARjGGJE3yM3aZI8g3vqywCkww/hPmSdBG3AiHpO0RItvWPhEVEe0TyB WqC6mpBLGn76ws20TyUxytKckE9JgJDN2M2vnnfUyCnULifrD7NkkI0OwCF2osEZaUQS MwSYCMm+S8eD4N3vZYzUoWwHcWRwHdbEEnvQp3MdUw+zH1ipOlyKpm0LojIWGa3rckXU UoRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=T0TkFFWcgAksB0r/eiWpvcxH5MHjEqDfjobzCtyWnt4=; b=wPcsgDNMdu0iypcCAONsv+PJ1SUyIvjTxNz09qxIpIVN8z/GfM1HZl/iW8Fsbuyuwm e5D6EZ/z4QAPAW1sUxIXyUDGArMEh68mp8uXsAA7DQJ9A5tOaKytD2YUXihDhIvXuhov ugoBYFrp/44egK+FOTrmFoNoy1lxV9GWGr3vWzAXWVgikQDWndTdwTK1sNX33mkUNkXZ P2CR5EwUbO+a08bK9GArCsAa2tM9YrwUDzVsPQP8abydmnN4mhKStR9vGSvRL5eIt5ed DojM0iGm7Tr+HoJnO+fbqr4Xwr4Q2/E29SfKCdpeKYl5sLMFCj7zHmk1d580Qer4ZB2Q knnA== X-Gm-Message-State: AOAM533huLEA8gy5bXpsB/SB0S7BaAYdHjYNQhN39pvnu7/cPwNCk5N9 w8ShxL3Ypx47s9qT542VPJU= X-Google-Smtp-Source: ABdhPJyezYxwcR0F1+1iaSAiJqCwx5d3/dCvaoN6S/JKkuTi32iCrCtK8z5qItsWOPPrwQtUqDrJcA== X-Received: by 2002:a37:b447:0:b0:649:33c4:bd5e with SMTP id d68-20020a37b447000000b0064933c4bd5emr15256858qkf.342.1646183682470; Tue, 01 Mar 2022 17:14:42 -0800 (PST) Received: from localhost.localdomain ([193.203.214.57]) by smtp.gmail.com with ESMTPSA id bq42-20020a05620a46aa00b006494fb49246sm7427360qkb.86.2022.03.01.17.14.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Mar 2022 17:14:42 -0800 (PST) From: cgel.zte@gmail.com X-Google-Original-From: lv.ruyi@zte.com.cn To: mingo@redhat.com Cc: juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, linux-kernel@vger.kernel.org, Lv Ruyi , Zeal Robot Subject: [PATCH] sched/topology: avoid calling synchronize_rcu() Date: Wed, 2 Mar 2022 01:14:33 +0000 Message-Id: <20220302011433.2054613-1-lv.ruyi@zte.com.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Lv Ruyi (CGEL ZTE) Kfree_rcu() usually results in even simpler code than does synchronize_rcu() without synchronize_rcu()'s multi-millisecond latency, so replace synchronize_rcu() with kfree_rcu(). Reported-by: Zeal Robot Signed-off-by: Lv Ruyi (CGEL ZTE) --- kernel/sched/topology.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 974212620fa1..0ce302b4d732 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1970,8 +1970,7 @@ static void sched_reset_numa(void) if (distances || masks) { int i, j; =20 - synchronize_rcu(); - kfree(distances); + kfree_rcu(distances); for (i =3D 0; i < nr_levels && masks; i++) { if (!masks[i]) continue; --=20 2.25.1