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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B36AC433F5 for ; Thu, 18 Nov 2021 03:54:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BA226137B for ; Thu, 18 Nov 2021 03:54:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242820AbhKRD5E (ORCPT ); Wed, 17 Nov 2021 22:57:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234183AbhKRD5C (ORCPT ); Wed, 17 Nov 2021 22:57:02 -0500 Received: from out1.migadu.com (out1.migadu.com [IPv6:2001:41d0:2:863f::]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3089C061570 for ; Wed, 17 Nov 2021 19:54:01 -0800 (PST) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1637207640; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=LrREcXjwq/HQrMWsNHaboy2+0WfVGFfGEWKwZ20dsZY=; b=XVAeP9VRMqOFpQnv4qcODLUcsoz3wM/pt/b7nLnJ5S2bmXNz3mdNQhmoXMpFaC7pppyyED Zu4bsGUcPIB8G6CkyCAOSFESdO7MrtsMAbgPCGO11uXF7BNyQNF0j411KWl22jbGzievWU ByEpmvYvvHj1VB0P9ZFy5cF5W6ofrNQ= From: Yajun Deng To: will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com Cc: linux-kernel@vger.kernel.org, Yajun Deng Subject: [PATCH] refcount: introduce refcount_is_one() helper function Date: Thu, 18 Nov 2021 11:53:28 +0800 Message-Id: <20211118035328.5730-1-yajun.deng@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: yajun.deng@linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are many cases where it is necessary to determine if refcount is one, introduce refcount_is_one() helper function for these cases. Signed-off-by: Yajun Deng --- include/linux/refcount.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/refcount.h b/include/linux/refcount.h index b8a6e387f8f9..1cc23c0e7454 100644 --- a/include/linux/refcount.h +++ b/include/linux/refcount.h @@ -147,6 +147,11 @@ static inline unsigned int refcount_read(const refcount_t *r) return atomic_read(&r->refs); } +static inline bool refcount_is_one(const refcount_t *r) +{ + return refcount_read(r) == 1; +} + static inline __must_check bool __refcount_add_not_zero(int i, refcount_t *r, int *oldp) { int old = refcount_read(r); -- 2.32.0