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SubjectRe: [PATCH v4 08/13] x86, kasan: clarify kasan's dependency on vmemmap_populate_hugepages()
On 03/16/2017 09:07 AM, Dan Williams wrote:
> Historically kasan has not been careful about whether vmemmap_populate()
> internally allocates a section worth of memmap even if the parameters
> call for less. For example, a request to shadow map a single page
> results in a full section (128MB) that contains that page being mapped.
> Also, kasan has not been careful to handle cases where this section
> promotion causes overlaps / overrides of previous calls to
> vmemmap_populate().
> Before we teach vmemmap_populate() to support sub-section hotplug,
> arrange for kasan to explicitly avoid vmemmap_populate_basepages().
> This should be functionally equivalent to the current state since
> CONFIG_KASAN requires x86_64 (implies PSE) and it does not collide with
> sub-section hotplug support since CONFIG_KASAN disables
> Cc: Dmitry Vyukov <>
> Cc: Alexander Potapenko <>
> Cc: Andrey Ryabinin <>
> Reported-by: Nicolai Stange <>
> Signed-off-by: Dan Williams <>

Acked-by: Andrey Ryabinin <>

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