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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,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 9200CC3A59F for ; Thu, 29 Aug 2019 17:38:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 68D4522CF5 for ; Thu, 29 Aug 2019 17:38:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="Kci5hxla" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728043AbfH2RiB (ORCPT ); Thu, 29 Aug 2019 13:38:01 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:52878 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727352AbfH2Rh7 (ORCPT ); Thu, 29 Aug 2019 13:37:59 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7THXmmB125448; Thu, 29 Aug 2019 17:37:42 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2019-08-05; bh=/1Teeq9B2y5clI8N5TuTurXVkSck+7pMqX7JZWWXUMk=; b=Kci5hxlaXvlnWY+oGMbnC3DG6oL5xYK3xfnubTdCEUfl8xhFN7gCqkU2v7R5O/zmsgbD k36tlyPS0thXL9OYNmFOcnIwhoM3JqeXCj98tj3bOmHCjg12hhzqCAwc/yFu8caLedd4 21aeDnT67Bz9wbEaWWYB6QohRMkyu4pVxM1njr3X+gK3lnWbw7Mo5vYwSySis/19+Vyt 5ahW/btQtqTB8pJU2Xqlm4x27SVy9ia3XWTHQHeWe5HldwgSc3lrFxIuxbanDCrrr/tn b4b6UXzYhfmyDsflTicLZwf2EuiP/BYhcEADfeYFkQWt3kwiUAIIttGCwJk300yDxCoi bw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 2upk56r2bg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 29 Aug 2019 17:37:42 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7THWabR008051; Thu, 29 Aug 2019 17:32:41 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2unvu0b2cs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 29 Aug 2019 17:32:41 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x7THWe7p002142; Thu, 29 Aug 2019 17:32:40 GMT Received: from zissou.us.oracle.com (/10.152.34.58) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 29 Aug 2019 10:32:40 -0700 From: Daniel Jordan To: Herbert Xu , Steffen Klassert Cc: Lai Jiangshan , Peter Zijlstra , Tejun Heo , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Jordan Subject: [PATCH v2 6/9] padata, pcrypt: take CPU hotplug lock internally in padata_alloc_possible Date: Thu, 29 Aug 2019 13:30:35 -0400 Message-Id: <20190829173038.21040-7-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190829173038.21040-1-daniel.m.jordan@oracle.com> References: <20190829173038.21040-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9364 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908290186 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9364 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908290186 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With pcrypt's cpumask no longer used, take the CPU hotplug lock inside padata_alloc_possible. Useful later in the series for avoiding nested acquisition of the CPU hotplug lock in padata when padata_alloc_possible is allocating an unbound workqueue. Without this patch, this nested acquisition would happen later in the series: pcrypt_init_padata get_online_cpus alloc_padata_possible alloc_padata alloc_workqueue(WQ_UNBOUND) // later in the series alloc_and_link_pwqs apply_wqattrs_lock get_online_cpus // recursive rwsem acquisition Signed-off-by: Daniel Jordan Acked-by: Steffen Klassert Cc: Herbert Xu Cc: Lai Jiangshan Cc: Peter Zijlstra Cc: Tejun Heo Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- crypto/pcrypt.c | 4 ---- kernel/padata.c | 17 +++++++++-------- 2 files changed, 9 insertions(+), 12 deletions(-) diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index 2ec36e6a132f..543792e0ebf0 100644 --- a/crypto/pcrypt.c +++ b/crypto/pcrypt.c @@ -308,8 +308,6 @@ static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) { int ret = -ENOMEM; - get_online_cpus(); - *pinst = padata_alloc_possible(name); if (!*pinst) return ret; @@ -318,8 +316,6 @@ static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) if (ret) padata_free(*pinst); - put_online_cpus(); - return ret; } diff --git a/kernel/padata.c b/kernel/padata.c index 863053a1e379..29d44edd6733 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -907,8 +907,6 @@ static struct kobj_type padata_attr_type = { * @name: used to identify the instance * @pcpumask: cpumask that will be used for padata parallelization * @cbcpumask: cpumask that will be used for padata serialization - * - * Must be called from a cpus_read_lock() protected region */ static struct padata_instance *padata_alloc(const char *name, const struct cpumask *pcpumask, @@ -926,11 +924,13 @@ static struct padata_instance *padata_alloc(const char *name, if (!pinst->wq) goto err_free_inst; + get_online_cpus(); + if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) - goto err_free_wq; + goto err_put_cpus; if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { free_cpumask_var(pinst->cpumask.pcpu); - goto err_free_wq; + goto err_put_cpus; } if (!padata_validate_cpumask(pinst, pcpumask) || !padata_validate_cpumask(pinst, cbcpumask)) @@ -956,12 +956,16 @@ static struct padata_instance *padata_alloc(const char *name, cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD, &pinst->node); #endif + + put_online_cpus(); + return pinst; err_free_masks: free_cpumask_var(pinst->cpumask.pcpu); free_cpumask_var(pinst->cpumask.cbcpu); -err_free_wq: +err_put_cpus: + put_online_cpus(); destroy_workqueue(pinst->wq); err_free_inst: kfree(pinst); @@ -975,12 +979,9 @@ static struct padata_instance *padata_alloc(const char *name, * parallel workers. * * @name: used to identify the instance - * - * Must be called from a cpus_read_lock() protected region */ struct padata_instance *padata_alloc_possible(const char *name) { - lockdep_assert_cpus_held(); return padata_alloc(name, cpu_possible_mask, cpu_possible_mask); } EXPORT_SYMBOL(padata_alloc_possible); -- 2.23.0