linux-kernel - revert dma-mapping and vmap API abuse in qcom_q6v5

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Date:   Fri, 23 Dec 2022 10:27:01 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux.dev
Subject: revert dma-mapping and vmap API abuse in qcom_q6v5_mss

Hi all,

this series reverts a completely broken commit to qcom_q6v5_mss the
abuses the dma-mapping and vmap APIs in multiple, and mostly clearly
documented ways, and then adds a patch to document and reject the
so far undocumented API abuse.

Diffstat:
 drivers/remoteproc/qcom_q6v5_mss.c |   38 +++++--------------------------------
 mm/vmalloc.c                       |    3 ++
 2 files changed, 9 insertions(+), 32 deletions(-)