Message ID | 20190610221621.10938-10-hch@lst.de (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id p17si10519210plo.310.2019.06.10.15.16.51 for <linux-mm@kvack.org> (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 10 Jun 2019 15:16:51 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+ba9daad91d8a220a3b0a+5769+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=V8RFOZDd; spf=pass (google.com: best guess record for domain of batv+ba9daad91d8a220a3b0a+5769+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+ba9daad91d8a220a3b0a+5769+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=h6J+QiOYKdoEDaESTAbqz0t3lndQulVAC+cSepnSvyI=; b=V8RFOZDdLN5chLDdbnVNK9dlJ1 uM5w5wcrJO3+EZ1UHI1Wb7sGkact57SKESY7N/vrePmN6J9ymUTz0rocYalDwv/x5hQ+IMedgMgAc wl6Un4zMZ9Pe5bagqhYSEtmiqTQ5qDi9szAP/8e+L78AffT8CyyjsSzgAAzL+VkZHLWLqSw2PT+xi NPVGY7HJQr8dQJ2jazZN8KiG5Qyp03r+KVbBUNwDG4/KFvxHaoNQ4VU0M/CQbtQ3W1ydVkspsO9pe K2BhHiKUh/3u+35Jh73MILlEk6vMV5B3d6bz/+a+UG6CN8qTERqDNty7DmYmFk/eOhRcveplsenzs KD1Mi8vw==; Received: from 089144193064.atnat0002.highway.a1.net ([89.144.193.64] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1haSat-0003Ll-PD; Mon, 10 Jun 2019 22:16:48 +0000 From: Christoph Hellwig <hch@lst.de> To: Palmer Dabbelt <palmer@sifive.com> Cc: Damien Le Moal <damien.lemoal@wdc.com>, linux-riscv@lists.infradead.org, uclinux-dev@uclinux.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 09/17] riscv: improve the default power off implementation Date: Tue, 11 Jun 2019 00:16:13 +0200 Message-Id: <20190610221621.10938-10-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190610221621.10938-1-hch@lst.de> References: <20190610221621.10938-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org. 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[01/17] mm: provide a print_vma_addr stub for !CONFIG_MMU
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diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c index cfb6eb1d762d..17c810985ad0 100644 --- a/arch/riscv/kernel/reset.c +++ b/arch/riscv/kernel/reset.c @@ -8,8 +8,11 @@ static void default_power_off(void) { +#ifndef CONFIG_M_MODE sbi_shutdown(); - while (1); +#endif + while (1) + wait_for_interrupt(); } void (*pm_power_off)(void) = default_power_off;
Only call the SBI code if we are not running in M mode, and if we didn't do the SBI call, or it didn't succeed call wfi in a loop to at least save some power. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/riscv/kernel/reset.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)