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 <redacted>
Suggested-by: Russell King <linux@armlinux.org.uk>
Suggested-by: Matthew Wilcox <willy@infradead.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@sntech.de>

Heiko



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