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[109.252.170.211]) by smtp.googlemail.com with ESMTPSA id v196sm54763lfa.96.2020.09.29.22.10.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Sep 2020 22:10:00 -0700 (PDT) Subject: Re: [PATCH v2 3/3] iommu/tegra-smmu: Add PCI support To: Nicolin Chen , thierry.reding@gmail.com, joro@8bytes.org, krzk@kernel.org Cc: vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20200930003013.31289-1-nicoleotsuka@gmail.com> <20200930003013.31289-4-nicoleotsuka@gmail.com> From: Dmitry Osipenko Message-ID: <27b155ec-97ab-98f6-7b48-3fded875d5cc@gmail.com> Date: Wed, 30 Sep 2020 08:10:00 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200930003013.31289-4-nicoleotsuka@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 30.09.2020 03:30, Nicolin Chen пишет: ... > +#ifdef CONFIG_PCI > + if (!iommu_present(&pci_bus_type)) { Could you please explain why this check is needed?