From patchwork Sat Feb 27 00:06:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 12107465 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 2FA34C433E6 for ; Sat, 27 Feb 2021 00:08:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 055B464F13 for ; Sat, 27 Feb 2021 00:08:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230112AbhB0AI0 (ORCPT ); Fri, 26 Feb 2021 19:08:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229989AbhB0AIY (ORCPT ); Fri, 26 Feb 2021 19:08:24 -0500 Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EA3EC06178B for ; Fri, 26 Feb 2021 16:07:06 -0800 (PST) Received: by mail-il1-x12c.google.com with SMTP id v8so5918222ilh.12 for ; Fri, 26 Feb 2021 16:07:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V/QgjySotsTTVdKM924dOYklYwsFMiK/ajNbbKthpHA=; b=gLHBNYEJB/sf0lZ4/ATW+Te0FFR47NHf7VvIgvncrWMDr5Ncc0RCGYGjoIHAF032oi JZBSvAxvwcy5o7uTFm1+5BqHSiF9W0SW1cjn/bXvhzUiDceQ3LeniAVFq6thAp81JvWu 5ME9RGS1HUB9ZBRDkOe8pZE0R3lAGwRgLDfp4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=V/QgjySotsTTVdKM924dOYklYwsFMiK/ajNbbKthpHA=; b=fxpe+sv7fKbpd1W7gVKX0RVieGKuMZ+Nd16rBpk4jkRirvOrfb5RUFoXVUAyPh7plx HIdTxQjxg1Tjrjl0b0LU8iXLeenikSovDznUpsjX/C4XL9mb+Lzwg5ZBlrIKFVq8ExIh yEidWA3PKnlqE6zQRx/+Xv1az/InfDlG7j52U1HYM1Y8ZK6xuWJ/E3t1s4vTgpAtNh8k 76r+ZHZ+y+GMJuOJczTHXS94cFzyYkvnlTXh1ue93JTXCBIjTHoFgxs13vrUpWJ5rGhG u+v57pf5p1BDVQz8qiwSzZ06ENQ2NEbY78nWQBpjli1QcCYLNwOF/ByDL4qt77QdmrNB 8Opw== X-Gm-Message-State: AOAM532ryGfyCv4cmJFHdQsGh4oTAd510h+PAVubX+8LfVMQcN9g8tCW JfoEhWXpcsRFa9g4j9cevwREYw== X-Google-Smtp-Source: ABdhPJyAon+ilh2FwUVc+YIJ6cSHG5ttF/eYAm9QraH2G+xx/rqg1Cg24nqYIM0+3ZcYRrFDVdxVAA== X-Received: by 2002:a05:6e02:152f:: with SMTP id i15mr4713534ilu.277.1614384425759; Fri, 26 Feb 2021 16:07:05 -0800 (PST) Received: from shuah-t480s.internal (c-24-9-64-241.hsd1.co.comcast.net. [24.9.64.241]) by smtp.gmail.com with ESMTPSA id w16sm5228805ilh.35.2021.02.26.16.07.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 16:07:05 -0800 (PST) From: Shuah Khan To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Cc: Shuah Khan , ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 2/3] lockdep: add lockdep lock state defines Date: Fri, 26 Feb 2021 17:06:59 -0700 Message-Id: <55548ba63a7e1b9f17cfc50370dcedefc9d5dd9f.1614383025.git.skhan@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Adds defines for lock state returns from lock_is_held_type() based on Johannes Berg's suggestions as it make it easier to read and maintain the lock states. These are defines and a enum to avoid changes to lock_is_held_type() and lockdep_is_held() return types. Updates to lock_is_held_type() and __lock_is_held() to use the new defines. Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ Signed-off-by: Shuah Khan --- include/linux/lockdep.h | 11 +++++++++-- kernel/locking/lockdep.c | 11 ++++++----- 2 files changed, 15 insertions(+), 7 deletions(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index dbd9ea846b36..17805aac0e85 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -268,6 +268,11 @@ extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, extern void lock_release(struct lockdep_map *lock, unsigned long ip); +/* lock_is_held_type() returns */ +#define LOCK_STATE_UNKNOWN -1 +#define LOCK_STATE_NOT_HELD 0 +#define LOCK_STATE_HELD 1 + /* * Same "read" as for lock_acquire(), except -1 means any. */ @@ -302,11 +307,13 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie); #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) #define lockdep_assert_held(l) do { \ - WARN_ON(debug_locks && lockdep_is_held(l) == 0); \ + WARN_ON(debug_locks && \ + lockdep_is_held(l) == LOCK_STATE_NOT_HELD); \ } while (0) #define lockdep_assert_not_held(l) do { \ - WARN_ON(debug_locks && lockdep_is_held(l) == 1); \ + WARN_ON(debug_locks && \ + lockdep_is_held(l) == LOCK_STATE_HELD); \ } while (0) #define lockdep_assert_held_write(l) do { \ diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 818d0ceed3eb..f5a8200f24f1 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -54,6 +54,7 @@ #include #include #include +#include #include @@ -5252,13 +5253,13 @@ int __lock_is_held(const struct lockdep_map *lock, int read) if (match_held_lock(hlock, lock)) { if (read == -1 || hlock->read == read) - return 1; + return LOCK_STATE_HELD; - return 0; + return LOCK_STATE_NOT_HELD; } } - return 0; + return LOCK_STATE_NOT_HELD; } static struct pin_cookie __lock_pin_lock(struct lockdep_map *lock) @@ -5537,14 +5538,14 @@ EXPORT_SYMBOL_GPL(lock_release); noinstr int lock_is_held_type(const struct lockdep_map *lock, int read) { unsigned long flags; - int ret = 0; + int ret = LOCK_STATE_NOT_HELD; /* * avoid false negative lockdep_assert_held() and * lockdep_assert_not_held() */ if (unlikely(!lockdep_enabled())) - return -1; + return LOCK_STATE_UNKNOWN; raw_local_irq_save(flags); check_flags(flags);