[PATCH v5 0/1] Add bounds check for Hotplugged memory

["Alastair D'Silva" <alastair@xxxxxxxxxxx>]

From: Alastair D'Silva <alastair@xxxxxxxxxxx>

This series adds bounds checks for hotplugged memory, ensuring that
it is within the physically addressable range (for platforms that
define MAX_(POSSIBLE_)PHYSMEM_BITS.

This allows for early failure, rather than attempting to access
bogus section numbers.

Changelog:
 V5:
   - Factor out calculation into max_allowed var
   - Declare unchanging vars as const
   - Use PFN_PHYS macro instead of shifting by PAGE_SHIFT
 V4:
   - Relocate call to __add_pages
   - Add a warning when the addressable check fails
 V3:
   - Perform the addressable check before we take the hotplug lock
 V2:
   - Don't use MAX_POSSIBLE_PHYSMEM_BITS as it's wider that what
     may be available

Alastair D'Silva (1):
  memory_hotplug: Add a bounds check to __add_pages

 mm/memory_hotplug.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

-- 
2.21.0