Message ID | 20190701062020.19239-16-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 p97si9685310pjp.34.2019.06.30.23.21.00 for <linux-mm@kvack.org> (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 30 Jun 2019 23:21:00 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+bb02ddf78a79a38d855c+5790+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=PSbfEnpL; spf=pass (google.com: best guess record for domain of batv+bb02ddf78a79a38d855c+5790+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+bb02ddf78a79a38d855c+5790+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: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To: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=K+5Y7Ez4pfTMCmPiyIGRChGh4O04+aapHsZzDHBkVJo=; b=PSbfEnpLRE8SG9bLML+fRlhf0 HtVXUwpI1yGra8E8q+rwV6qJm4ONJSDzOZ753xm3ERQHmxUjdhHbZaiUebewXGu/ryXEdIqi7spGD Nlr6XlnU/i9TC0WMqh3qrx9cT7ITHZkOAeu54JXvWWQ2MaeC+xjlwX/7+GOXnST0/kVvSEpc1HmW/ hO3augHviB0cDdLARWF6uP/j90BGjEpU45QJHn+ssAOFsyOrVWV8bsQFxpmwUu7D3kHoTQPtfD/+9 h1Gpz4y5W71lm5fa5MIvKeZct6x0kCAYyPKLWFw3cLp1onhIVhjCvfTwvaeENThWQJ0FWVoyh0659 oBUZxg5rA==; Received: from [46.140.178.35] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hhpgO-00034k-I0; Mon, 01 Jul 2019 06:20:57 +0000 From: Christoph Hellwig <hch@lst.de> To: Dan Williams <dan.j.williams@intel.com>, =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>, Jason Gunthorpe <jgg@mellanox.com>, Ben Skeggs <bskeggs@redhat.com> Cc: Ira Weiny <ira.weiny@intel.com>, linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, John Hubbard <jhubbard@nvidia.com>, Souptick Joarder <jrdr.linux@gmail.com>, Ralph Campbell <rcampbell@nvidia.com>, Philip Yang <Philip.Yang@amd.com> Subject: [PATCH 15/22] mm/hmm: Poison hmm_range during unregister Date: Mon, 1 Jul 2019 08:20:13 +0200 Message-Id: <20190701062020.19239-16-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190701062020.19239-1-hch@lst.de> References: <20190701062020.19239-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
[01/22] mm/hmm.c: suppress compilation warnings when CONFIG_HUGETLB_PAGE is not set
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expand
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diff --git a/mm/hmm.c b/mm/hmm.c index 2ef14b2b5505..c30aa9403dbe 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -925,19 +925,21 @@ void hmm_range_unregister(struct hmm_range *range) { struct hmm *hmm = range->hmm; - /* Sanity check this really should not happen. */ - if (hmm == NULL || range->end <= range->start) - return; - mutex_lock(&hmm->lock); list_del_init(&range->list); mutex_unlock(&hmm->lock); /* Drop reference taken by hmm_range_register() */ - range->valid = false; mmput(hmm->mm); hmm_put(hmm); - range->hmm = NULL; + + /* + * The range is now invalid and the ref on the hmm is dropped, so + * poison the pointer. Leave other fields in place, for the caller's + * use. + */ + range->valid = false; + memset(&range->hmm, POISON_INUSE, sizeof(range->hmm)); } EXPORT_SYMBOL(hmm_range_unregister);