Re: [PATCH v11 7/9] arm64/kasan: add and use kasan_map_populate()

[Will Deacon]

Hi Pavel,

On Mon, Oct 09, 2017 at 06:19:29PM -0400, Pavel Tatashin wrote:
> During early boot, kasan uses vmemmap_populate() to establish its shadow
> memory. But, that interface is intended for struct pages use.
> 
> Because of the current project, vmemmap won't be zeroed during allocation,
> but kasan expects that memory to be zeroed. We are adding a new
> kasan_map_populate() function to resolve this difference.
> 
> Therefore, we must use a new interface to allocate and map kasan shadow
> memory, that also zeroes memory for us.
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
> ---
>  arch/arm64/mm/kasan_init.c | 72 ++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 66 insertions(+), 6 deletions(-)

Thanks for doing this, although I still think we can do better and avoid the
additional walking code altogether, as well as removing the dependence on
vmemmap. Rather than keep messing you about here (sorry about that), I've
written an arm64 patch for you to take on top of this series. Please take
a look below.

Cheers,

Will

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