On 17.09.19 03:07, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@xxxxxxxxxxx>
>
> The call to check_hotplug_memory_addressable() validates that the memory
> is fully addressable.
>
> Without this call, it is possible that we may remap pages that is
> not physically addressable, resulting in bogus section numbers
> being returned from __section_nr().
>
> Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
> ---
> mm/memremap.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/mm/memremap.c b/mm/memremap.c
> index 86432650f829..de2b67586401 100644
> --- a/mm/memremap.c
> +++ b/mm/memremap.c
> @@ -175,6 +175,11 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
> int error, nid, is_ram;
> bool need_devmap_managed = true;
>
> + error = check_hotplug_memory_addressable(res->start,
> + resource_size(res));
> + if (error)
> + return ERR_PTR(error);
> +
> switch (pgmap->type) {
> case MEMORY_DEVICE_PRIVATE:
> if (!IS_ENABLED(CONFIG_DEVICE_PRIVATE)) {
>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
--
Thanks,
David / dhildenb
