From patchwork Thu Apr 16 22:01:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11493865 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 98E0F15AB for ; Thu, 16 Apr 2020 22:01:37 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 781BA22245 for ; Thu, 16 Apr 2020 22:01:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RsiCBhcZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 781BA22245 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :Subject:To:From:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=7eAIqFXSDQFiyBAhlUDSnkB/PjfNj7n3kLMRm+bVFLI=; b=RsiCBhcZVAh4ZZ 0N6tDVY3r4Yh+/JzGLubxzBbjB8xtRJmeTyuVSUzZ+Lh08csWOtjTOF2FLXCZhAnY06/wEdRHOHH9 Bc6nsLi4VuKLglV0eaTVQa/QZEH5MxcGbOVfoEDgBIKQ/ornptBxUhObv+H6xUh7DLJPxH56vucFR bhxKSp9r47GNxsGdXDSQ9UEB1/jleJVlcTgh31h7Uqmk9OiRFO4LD8KkI05oW5J3M/BzM/Qf9QrIa ZLyG5wMADuHzl+4j8cqri+h9A43JKJSYeeVP+i+RxNpMHl9DxL/O6QMUbS4cljjpALMuL2WHO1gBq iWhnI8pO+aUT+kJUZ9Yg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jPCZj-0003Ws-IV; Thu, 16 Apr 2020 22:01:35 +0000 Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jPCZg-0003UR-Hw; Thu, 16 Apr 2020 22:01:32 +0000 From: Matthew Wilcox To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v3 05/11] riscv: Add clear_bit_unlock_is_negative_byte implementation Date: Thu, 16 Apr 2020 15:01:24 -0700 Message-Id: <20200416220130.13343-6-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200416220130.13343-1-willy@infradead.org> References: <20200416220130.13343-1-willy@infradead.org> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-riscv@lists.infradead.org, Albert Ou , Palmer Dabbelt , "Matthew Wilcox \(Oracle\)" , Paul Walmsley Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org From: "Matthew Wilcox (Oracle)" This is the generic implementation. I can't figure out an optimised implementation for riscv. Signed-off-by: Matthew Wilcox (Oracle) Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: linux-riscv@lists.infradead.org --- arch/riscv/include/asm/bitops.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h index 396a3303c537..f2060c126a34 100644 --- a/arch/riscv/include/asm/bitops.h +++ b/arch/riscv/include/asm/bitops.h @@ -171,6 +171,13 @@ static inline void clear_bit_unlock( __op_bit_ord(and, __NOT, nr, addr, .rl); } +static inline bool clear_bit_unlock_is_negative_byte(unsigned int nr, + volatile unsigned long *p) +{ + clear_bit_unlock(nr, p); + return test_bit(7, p); +} + /** * __clear_bit_unlock - Clear a bit in memory, for unlock * @nr: the bit to set