From patchwork Wed Oct 19 22:59:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 13012482 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 109E5C4332F for ; Wed, 19 Oct 2022 23:00:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231549AbiJSXAh (ORCPT ); Wed, 19 Oct 2022 19:00:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231542AbiJSXA1 (ORCPT ); Wed, 19 Oct 2022 19:00:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93EDB15B13B; Wed, 19 Oct 2022 16:00:16 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 622B0B8261C; Wed, 19 Oct 2022 22:59:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17778C433B5; Wed, 19 Oct 2022 22:59:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666220394; bh=heTCFvJswDxBI5C8hvwOT7FdiUNoVomfpcqIASj0cow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z1E62sMfLfhnh58D1mkPx6OYantfcmfSqflPqrbJ2+y6FpxT4KGkmRvO9732MdKBO u7+OM/6Ck0cM4LYJ9L/gAJ0GAdvuZ5POZcM2Dpp8t4IsindxUXPh8aextHmyRRSObO h0uxRRlzXW8kEanYVFgkM/gamkkKSATIPW3o1PN139xkPzzWnM+T40XCx3goTIEnBX GA7RN7OcpUM+wsvNlwt+Hnd11+GXPmV5KadMRApMwd7ROdcwzlGgY6s6tF3Djc+KN4 C3kbRO+DzhuOIUKzeHqLftOrHbbnAQxyY3WOmoy/pm06jaip4/jgMmQBj/wNhJHX3Z CiJKi29c0DGzA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id C7BEC5C06B4; Wed, 19 Oct 2022 15:59:53 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, rostedt@goodmis.org, "Paul E. McKenney" Subject: [PATCH v3 rcu 1/2] rcutorture: Verify NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE Date: Wed, 19 Oct 2022 15:59:51 -0700 Message-Id: <20221019225952.2501399-1-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20221019225946.GA2501259@paulmck-ThinkPad-P17-Gen-1> References: <20221019225946.GA2501259@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org This commit adds code to the RTWS_POLL_GET_FULL case of rcu_torture_writer() to verify that the value of NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE is sufficiently large. [ paulmck: Fix whitespace issue located by checkpatch.pl. ] Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 503c2aa845a4a..b6885767ce46e 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -357,6 +357,8 @@ struct rcu_torture_ops { bool (*poll_gp_state_exp)(unsigned long oldstate); void (*cond_sync_exp)(unsigned long oldstate); void (*cond_sync_exp_full)(struct rcu_gp_oldstate *rgosp); + void (*get_comp_state_full)(struct rcu_gp_oldstate *rgosp); + bool (*same_gp_state_full)(struct rcu_gp_oldstate *rgosp1, struct rcu_gp_oldstate *rgosp2); unsigned long (*get_gp_state)(void); void (*get_gp_state_full)(struct rcu_gp_oldstate *rgosp); unsigned long (*get_gp_completed)(void); @@ -535,6 +537,8 @@ static struct rcu_torture_ops rcu_ops = { .deferred_free = rcu_torture_deferred_free, .sync = synchronize_rcu, .exp_sync = synchronize_rcu_expedited, + .same_gp_state_full = same_state_synchronize_rcu_full, + .get_comp_state_full = get_completed_synchronize_rcu_full, .get_gp_state = get_state_synchronize_rcu, .get_gp_state_full = get_state_synchronize_rcu_full, .get_gp_completed = get_completed_synchronize_rcu, @@ -1264,7 +1268,8 @@ static void rcu_torture_write_types(void) } else if (gp_poll && (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)) { pr_alert("%s: gp_poll without primitives.\n", __func__); } - if (gp_poll_full1 && cur_ops->start_gp_poll_full && cur_ops->poll_gp_state_full) { + if (gp_poll_full1 && cur_ops->get_comp_state_full && cur_ops->same_gp_state_full + && cur_ops->start_gp_poll_full && cur_ops->poll_gp_state_full) { synctype[nsynctypes++] = RTWS_POLL_GET_FULL; pr_info("%s: Testing polling full-state GPs.\n", __func__); } else if (gp_poll_full && (!cur_ops->start_gp_poll_full || !cur_ops->poll_gp_state_full)) { @@ -1340,9 +1345,11 @@ rcu_torture_writer(void *arg) int expediting = 0; unsigned long gp_snap; struct rcu_gp_oldstate gp_snap_full; + struct rcu_gp_oldstate gp_snap1_full; int i; int idx; int oldnice = task_nice(current); + struct rcu_gp_oldstate rgo[NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE]; struct rcu_torture *rp; struct rcu_torture *old_rp; static DEFINE_TORTURE_RANDOM(rand); @@ -1472,11 +1479,23 @@ rcu_torture_writer(void *arg) break; case RTWS_POLL_GET_FULL: rcu_torture_writer_state = RTWS_POLL_GET_FULL; + for (i = 0; i < ARRAY_SIZE(rgo); i++) + cur_ops->get_comp_state_full(&rgo[i]); cur_ops->start_gp_poll_full(&gp_snap_full); rcu_torture_writer_state = RTWS_POLL_WAIT_FULL; - while (!cur_ops->poll_gp_state_full(&gp_snap_full)) + while (!cur_ops->poll_gp_state_full(&gp_snap_full)) { + cur_ops->get_gp_state_full(&gp_snap1_full); + for (i = 0; i < ARRAY_SIZE(rgo); i++) + if (cur_ops->poll_gp_state_full(&rgo[i]) || + cur_ops->same_gp_state_full(&rgo[i], + &gp_snap1_full)) { + rgo[i] = gp_snap1_full; + break; + } + WARN_ON_ONCE(i >= ARRAY_SIZE(rgo)); torture_hrtimeout_jiffies(torture_random(&rand) % 16, &rand); + } rcu_torture_pipe_update(old_rp); break; case RTWS_POLL_GET_EXP: