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

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Message-ID: <1572595.mVW1PIlZyR@phil>
Date:   Thu, 31 Jan 2019 13:34:10 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Souptick Joarder <jrdr.linux@...il.com>, hjc@...k-chips.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        vbabka@...e.cz, Rik van Riel <riel@...riel.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        rppt@...ux.vnet.ibm.com, Peter Zijlstra <peterz@...radead.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        robin.murphy@....com, airlied@...ux.ie,
        oleksandr_andrushchenko@...m.com, joro@...tes.org,
        pawel@...iak.com, Kyungmin Park <kyungmin.park@...sung.com>,
        mchehab@...nel.org, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        Linux-MM <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, 13:31:52 CET schrieb Souptick Joarder:
> On Thu, Jan 31, 2019 at 5:37 PM Heiko Stuebner <heiko@...ech.de> wrote:
> >
> > 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>
> 
> Change log is available in [0/9].
> Patch [1/9] & [4/9] have no changes between v1 -> v2.

I never seem to get your cover-letters, so didn't see that, sorry.

But great that there weren't changes then :-)

Heiko