From patchwork Tue Feb 11 09:19:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 207321 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 B0B3CC3B186 for ; Tue, 11 Feb 2020 09:20:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 82F8320842 for ; Tue, 11 Feb 2020 09:20:19 +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="bvlde9/B" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727873AbgBKJUS (ORCPT ); Tue, 11 Feb 2020 04:20:18 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:37643 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727904AbgBKJTt (ORCPT ); Tue, 11 Feb 2020 04:19:49 -0500 Received: by mail-wm1-f67.google.com with SMTP id a6so2524815wme.2 for ; Tue, 11 Feb 2020 01:19:48 -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=J6ZLNj2Gq0W0Yaf5OErI6mxsCNdT2eS8KG7ezcB9dY0=; b=bvlde9/BYWUt6yX6B3axWW/EXQmlMl7L/is9C1EKF8Nx4zE9fM88462YL3CmM28ioo GH3iIhRZllHSdtjSSov1oy10smvIWwyQQi3cpc8C/meYywWKxyeTfPrd27JSUgJngcxP cP5cvQhg1dsawZLIQCnMJ3tJNGV5LakxTH6BY5YHtAoek2x0s8fek2tx0fY+SkmKg3Ux mH6Vj1sPdc9YxdMCamsUNWTxV1j75xySd/ke1LMmwx+VfDj4HjwGlMi4h5WxQQX/kjIZ oxdMXoto6p+tODUU5saArZQ6thjikM1uE4x1cirtB9sKiVeVYoPVwUfutJkZbcavbaaz Ab2A== 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=J6ZLNj2Gq0W0Yaf5OErI6mxsCNdT2eS8KG7ezcB9dY0=; b=imOCreHZgyuzVHnbaa0J7H/MqGwolOByO9DpfcPtvfoMyrQ8nwj6Sm+74Mda7iE/2L dTGYSRrARN45RfntfjdpQJm6L1aiFYZIk88O03oKNtO4VoqsXMoS7mZu61kDib0YR7do Fdlmz7PTMsGI8LG3iGKekZ2YRpMc4zi202207uy7VQiBRjH9FZzn22O/88AL7TXtAPMb btNp5aBUHt5rzeSiYxA8AoJiAASxUlP1xYRiau8pNXbN6T157qzpYbn6LHTZ717AqNn+ +gd7BPHAu9hKxTFXOuy0Y4qIjcx/8J00DArMALvBQj+Sq3SPvHZkxtiRkrJWoXBmXgLi KPjA== X-Gm-Message-State: APjAAAUdm9PaX1MU7u72cpmserpUHzBeFZb622noj12ZY4AQdJUfgifa QAEzB+94JPVoCfOQc9+fQiPCXw== X-Google-Smtp-Source: APXvYqxHjKZdZWKhZS3AoeVyH3NMEieAbdcgVVvcmpoGXTu4vuIZJaP8GCNGxLmznkRrQAzrQ9SNuA== X-Received: by 2002:a1c:ddd6:: with SMTP id u205mr4689065wmg.151.1581412787259; Tue, 11 Feb 2020 01:19:47 -0800 (PST) Received: from localhost.localdomain (lfbn-nic-1-65-232.w2-15.abo.wanadoo.fr. [2.15.156.232]) by smtp.gmail.com with ESMTPSA id y131sm2958622wmc.13.2020.02.11.01.19.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Feb 2020 01:19:46 -0800 (PST) From: Bartosz Golaszewski To: Kent Gibson , Linus Walleij , Andy Shevchenko Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski , Stefani Seibold Subject: [RESEND PATCH v6 2/7] kfifo: provide kfifo_is_empty_spinlocked() Date: Tue, 11 Feb 2020 10:19:32 +0100 Message-Id: <20200211091937.29558-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200211091937.29558-1-brgl@bgdev.pl> References: <20200211091937.29558-1-brgl@bgdev.pl> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@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 Acked-by: Stefani Seibold --- 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