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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 D8A00C32771 for ; Thu, 9 Jan 2020 11:50:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF5242072A for ; Thu, 9 Jan 2020 11:50:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.b="I6txfwI9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729258AbgAILuY (ORCPT ); Thu, 9 Jan 2020 06:50:24 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:40084 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729028AbgAILuU (ORCPT ); Thu, 9 Jan 2020 06:50:20 -0500 Received: by mail-wm1-f67.google.com with SMTP id t14so2485272wmi.5 for ; Thu, 09 Jan 2020 03:50:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3GsK7s8K6DIS0JIxs6gZ15L0MgMAbrzcUa2gzsoGKiM=; b=I6txfwI90sjMIg0dqiroXeL928Rj7hB3V/5JvOX+/OemCDH/T9a/dtcEgv+mmoShkD 53jia1JCu5R9USQKUXjzn+pU9TZt4E/6qBvTLLpAal8g2aJZ9bBcZYxH3F7Gh3sidxqF iySg7DW+gdoVxk8JAn3o3HwQ3fUN7/p8C7/VXwElL7u1PAvYJtNw6UMxP4KlneZMq5qX 8RWeWoa0hSkk4y7OSduZySI+UvOFnFmEbwQZ92j5OmnXIXIwtPvK0Hp1/n8fKyX0W0E0 3HqAINB4wMAZJb0hCtyPAVz2VDWGKXYiVqQcowx6qJNkfr2HUokLO4vdamJ38q9UqJq5 pGTQ== 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=3GsK7s8K6DIS0JIxs6gZ15L0MgMAbrzcUa2gzsoGKiM=; b=bwI5WVDEIlra6dKSp4pzxdQVvA9quIyfNLg5uClxc9Q1cbeHJeP26vIIBeppaq8/bA kKU5FWsWg5Z66eQ/IgkloJX9rofksngsmuKusFEZB1TuABK5+0+9KBDcYxxGcOZA/GGG 5Cbi9jVelX+qwUO7p+yV5Ug27G5xmbkfGZTn4sUzItFIuzmcWETd1FR5GAyuTXRn/pHH AlGRnHsj+rHE2N9v0du9nRWJcZ+gPgVCsU7DtQclWCKXlXMRf7mscSZ17IaFp4oHPDwU E1o2CNyiXbEWhGEXNWc1t6Dk9eDkVKxXA8ttX152wYR18yl49lr1gY+Vv4Spp2hFPPp4 dwWQ== X-Gm-Message-State: APjAAAVAaz5RSAQmOpB7aDrJZVwXUAq/K/VryCVung38tcIDf1VlFUTL +gDobaeK1l8kZ6dxukIIMAi99+v0uSI= X-Google-Smtp-Source: APXvYqzNkYXAmDxnxKgTQKco5PlOQHcCMYerJYTlTTJNn7H+Ku5b6ZFIjSHuE6PVA/Iy81wD8KK/nA== X-Received: by 2002:a1c:7205:: with SMTP id n5mr4555286wmc.9.1578570617472; Thu, 09 Jan 2020 03:50:17 -0800 (PST) Received: from debian-brgl.home ([2a01:cb1d:af:5b00:6d6c:8493:1ab5:dad7]) by smtp.gmail.com with ESMTPSA id u16sm2574979wmj.41.2020.01.09.03.50.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 03:50:17 -0800 (PST) From: Bartosz Golaszewski To: Kent Gibson , Linus Walleij , Andy Shevchenko , Greg Kroah-Hartman , Andrew Morton Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v5 2/7] kfifo: provide kfifo_is_empty_spinlocked() Date: Thu, 9 Jan 2020 12:50:05 +0100 Message-Id: <20200109115010.27814-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200109115010.27814-1-brgl@bgdev.pl> References: <20200109115010.27814-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski Provide two spinlocked versions of kfifo_is_empty() to be used with spinlocked variants of kfifo_in() and kfifo_out(). Signed-off-by: Bartosz Golaszewski --- include/linux/kfifo.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index 123c200ed7cb..86249476b57f 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -246,6 +246,37 @@ __kfifo_int_must_check_helper(int val) __tmpq->kfifo.in == __tmpq->kfifo.out; \ }) +/** + * kfifo_is_empty_spinlocked - returns true if the fifo is empty using + * a spinlock for locking + * @fifo: address of the fifo to be used + * @lock: spinlock to be used for locking + */ +#define kfifo_is_empty_spinlocked(fifo, lock) \ +({ \ + unsigned long __flags; \ + bool __ret; \ + spin_lock_irqsave(lock, __flags); \ + __ret = kfifo_is_empty(fifo); \ + spin_unlock_irqrestore(lock, __flags); \ + __ret; \ +}) + +/** + * kfifo_is_empty_spinlocked_noirqsave - returns true if the fifo is empty + * using a spinlock for locking, doesn't disable interrupts + * @fifo: address of the fifo to be used + * @lock: spinlock to be used for locking + */ +#define kfifo_is_empty_spinlocked_noirqsave(fifo, lock) \ +({ \ + bool __ret; \ + spin_lock(lock); \ + __ret = kfifo_is_empty(fifo); \ + spin_unlock(lock); \ + __ret; \ +}) + /** * kfifo_is_full - returns true if the fifo is full * @fifo: address of the fifo to be used -- 2.23.0