Re: [PATCH v6 06/10] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()

2020-02-04 Thread Oscar Salvador
On Sun, Oct 06, 2019 at 10:56:42AM +0200, David Hildenbrand wrote:
> Let's poison the pages similar to when adding new memory in
> sparse_add_section(). Also call remove_pfn_range_from_zone() from
> memunmap_pages(), so we can poison the memmap from there as well.
> 
> While at it, calculate the pfn in memunmap_pages() only once.
> 
> Cc: Andrew Morton 
> Cc: David Hildenbrand 
> Cc: Oscar Salvador 
> Cc: Michal Hocko 
> Cc: Pavel Tatashin 
> Cc: Dan Williams 
> Signed-off-by: David Hildenbrand 

Looks good to me, it is fine as long as we do not access those pages later on,
and if my eyes did not lie to me, we have to proper checks (pfn_to_online_page)
in place to avoid that, so:

Reviewed-by: Oscar Salvador 

-- 
Oscar Salvador
SUSE L3


Re: [PATCH v6 06/10] mm/memory_hotplug: Poison memmap in remove_pfn_range_from_zone()

2019-10-16 Thread David Hildenbrand

On 06.10.19 10:56, David Hildenbrand wrote:

Let's poison the pages similar to when adding new memory in
sparse_add_section(). Also call remove_pfn_range_from_zone() from
memunmap_pages(), so we can poison the memmap from there as well.

While at it, calculate the pfn in memunmap_pages() only once.


FWIW, this comment is stale and could be dropped :)

--

Thanks,

David / dhildenb