linux-kernel - Re: [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range

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Date:   Thu, 31 Jan 2019 13:06:49 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     akpm@...ux-foundation.org, willy@...radead.org, mhocko@...e.com,
        kirill.shutemov@...ux.intel.com, vbabka@...e.cz, riel@...riel.com,
        sfr@...b.auug.org.au, rppt@...ux.vnet.ibm.com,
        peterz@...radead.org, linux@...linux.org.uk, robin.murphy@....com,
        iamjoonsoo.kim@....com, treding@...dia.com, keescook@...omium.org,
        m.szyprowski@...sung.com, stefanr@...6.in-berlin.de,
        hjc@...k-chips.com, airlied@...ux.ie,
        oleksandr_andrushchenko@...m.com, joro@...tes.org,
        pawel@...iak.com, kyungmin.park@...sung.com, mchehab@...nel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linux1394-devel@...ts.sourceforge.net,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, xen-devel@...ts.xen.org,
        iommu@...ts.linux-foundation.org, linux-media@...r.kernel.org
Subject: Re: [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range_buggy API

Am Donnerstag, 31. Januar 2019, 04:08:12 CET schrieb Souptick Joarder:
> Previouly drivers have their own way of mapping range of
> kernel pages/memory into user vma and this was done by
> invoking vm_insert_page() within a loop.
> 
> As this pattern is common across different drivers, it can
> be generalized by creating new functions and use it across
> the drivers.
> 
> vm_insert_range() is the API which could be used to mapped
> kernel memory/pages in drivers which has considered vm_pgoff
> 
> vm_insert_range_buggy() is the API which could be used to map
> range of kernel memory/pages in drivers which has not considered
> vm_pgoff. vm_pgoff is passed default as 0 for those drivers.
> 
> We _could_ then at a later "fix" these drivers which are using
> vm_insert_range_buggy() to behave according to the normal vm_pgoff
> offsetting simply by removing the _buggy suffix on the function
> name and if that causes regressions, it gives us an easy way to revert.
> 
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Suggested-by: Russell King <linux@...linux.org.uk>
> Suggested-by: Matthew Wilcox <willy@...radead.org>

hmm, I'm missing a changelog here between v1 and v2.
Nevertheless I managed to test v1 on Rockchip hardware
and display is still working, including talking to Lima via prime.

So if there aren't any big changes for v2, on Rockchip
Tested-by: Heiko Stuebner <heiko@...ech.de>

Heiko