linux-kernel - Re: [PATCH v17 19/35] arch/mm: Export direct {un,}map functions

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Date: Mon, 26 Feb 2024 03:06:11 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Christoph Hellwig <hch@...radead.org>, Will Deacon <will@...nel.org>,
	Quentin Perret <qperret@...gle.com>,
	Chris Goldsworthy <quic_cgoldswo@...cinc.com>,
	Android KVM <android-kvm@...gle.com>,
	Patrick Daly <quic_pdaly@...cinc.com>,
	Alex Elder <elder@...aro.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Murali Nalajal <quic_mnalajal@...cinc.com>,
	Trilok Soni <quic_tsoni@...cinc.com>,
	Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
	Carl van Schaik <quic_cvanscha@...cinc.com>,
	Philip Derrin <quic_pderrin@...cinc.com>,
	Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
	Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
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	Bjorn Andersson <andersson@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Fuad Tabba <tabba@...gle.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org,
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	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH v17 19/35] arch/mm: Export direct {un,}map functions

The point is that we can't we just allow modules to unmap data from
the kernel mapping, no matter how noble your intentions are.