Message ID | 20190724065258.16603-8-hch@lst.de (mailing list archive) |
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State | New, archived |
Headers | show
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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id r200si12394912pgr.518.2019.07.23.23.53.26 for <linux-mm@kvack.org> (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 23 Jul 2019 23:53:26 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+1e4efd27347a199fee4d+5813+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=gHoA3rLx; spf=pass (google.com: best guess record for domain of batv+1e4efd27347a199fee4d+5813+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+1e4efd27347a199fee4d+5813+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=jUagJle8tiqkx+fZcCE6Gfny4t7Azmd0YxZDCEv72fs=; b=gHoA3rLxbbBb8a0isoL8eqDuAd 5No71pHNiivV7f+CSgnKf/BnSlSNK6IHFCeFwtrWSRDbAHPCPDE3FP1zsCfMsYxHtJ90yYDlUxj2K HsjlpGb+HBDiw4pJkfZUt0rZPL3rR+vVkgO7MQ7aFVnbJ/dH6yr+BPTKxF7wdx1yMwjk0nxNfGN5a MeLw7sIA4cVOQlsewuFjuZ1oKKhb+BnYot7yxvtYabgThfnIv5HDf78+WbsMXOcknLuY5xH2VoJDX QIF4jW0Vtaeu3JTdStE89iThn0BlxErxbbHeDGs5EIrl76zsfFj/jdn5E2iKTaq3FlbL16zEG+dDX j7FGDjGg==; Received: from 089144207240.atnat0016.highway.bob.at ([89.144.207.240] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hqB9P-0004Mo-Lp; Wed, 24 Jul 2019 06:53:24 +0000 From: Christoph Hellwig <hch@lst.de> To: =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>, Jason Gunthorpe <jgg@mellanox.com>, Ben Skeggs <bskeggs@redhat.com> Cc: Ralph Campbell <rcampbell@nvidia.com>, linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 7/7] mm: comment on VM_FAULT_RETRY semantics in handle_mm_fault Date: Wed, 24 Jul 2019 08:52:58 +0200 Message-Id: <20190724065258.16603-8-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190724065258.16603-1-hch@lst.de> References: <20190724065258.16603-1-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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[1/7] mm: always return EBUSY for invalid ranges in hmm_range_{fault,snapshot}
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diff --git a/mm/hmm.c b/mm/hmm.c index 16b6731a34db..54b3a4162ae9 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -301,8 +301,10 @@ static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr, flags |= hmm_vma_walk->block ? 0 : FAULT_FLAG_ALLOW_RETRY; flags |= write_fault ? FAULT_FLAG_WRITE : 0; ret = handle_mm_fault(vma, addr, flags); - if (ret & VM_FAULT_RETRY) + if (ret & VM_FAULT_RETRY) { + /* Note, handle_mm_fault did up_read(&mm->mmap_sem)) */ return -EAGAIN; + } if (ret & VM_FAULT_ERROR) { *pfn = range->values[HMM_PFN_ERROR]; return -EFAULT;