From patchwork Tue Sep 3 09:32:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11127485 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 1FFFD112C for ; Tue, 3 Sep 2019 09:32:55 +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 ED27D230F2 for ; Tue, 3 Sep 2019 09:32:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="bj+bZ7zI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED27D230F2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de 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: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=EvSQI+o4Ry3iu9pdLScrARcnjpAiuBXN0p16V8F56jo=; b=bj+bZ7zI3nXjo5 89lOlfBFZuVRJoljed5aAMwfl6qlhbL4oHBGn1OH0VMTvszVETL++DMekIc1bd8O4APKq6KC+imhx bKI0vaLm753LoPIrPSRgVN6ad/xRVhWl3vwScRlxru+m565yA8PaiXLkOnkL/xLIJ2MGW61N5VCNA waT+g6WmkwQz99ItQn0ab6Pd1Aql3pnTuLI+9bAn5P/X8D2PgsRLSvaXqTHdFulxq71Y5Laa6PjtG NSkAUyI07GIhEjS0ezdBmfPxSONG2d/yzEzvbYrUC2muws0wcqR2X77VMT2kZLE+qTWK5U9WqB1d1 ZpvHWolsrQaoMQFOlPKA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i55BD-0004OU-7a; Tue, 03 Sep 2019 09:32:51 +0000 Received: from clnet-p19-102.ikbnet.co.at ([83.175.77.102] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1i55BA-0004Jn-2L; Tue, 03 Sep 2019 09:32:48 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Subject: [PATCH 03/20] riscv: cleanup send_ipi_mask Date: Tue, 3 Sep 2019 11:32:22 +0200 Message-Id: <20190903093239.21278-4-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190903093239.21278-1-hch@lst.de> References: <20190903093239.21278-1-hch@lst.de> 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: Atish Patra , Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org Use the special barriers for atomic bitops to make the intention a little more clear, and use riscv_cpuid_to_hartid_mask instead of open coding it. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra --- arch/riscv/kernel/smp.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index 8cd730239613..2e21669aa068 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -80,17 +80,15 @@ static void ipi_stop(void) static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op) { - int cpuid, hartid; struct cpumask hartid_mask; + int cpu; - cpumask_clear(&hartid_mask); - mb(); - for_each_cpu(cpuid, mask) { - set_bit(op, &ipi_data[cpuid].bits); - hartid = cpuid_to_hartid_map(cpuid); - cpumask_set_cpu(hartid, &hartid_mask); - } - mb(); + smp_mb__before_atomic(); + for_each_cpu(cpu, mask) + set_bit(op, &ipi_data[cpu].bits); + smp_mb__after_atomic(); + + riscv_cpuid_to_hartid_mask(mask, &hartid_mask); sbi_send_ipi(cpumask_bits(&hartid_mask)); }