config DEBUG_PAGEALLOC
  	bool "Debug page memory allocations"
  	depends on DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC
  	depends on !HIBERNATION || !PPC && !SPARC

  	depends on !KMEMCHECK

  	---help---
  	  Unmap pages from the kernel linear mapping after free_pages().
  	  This results in a large slowdown, but helps to find certain types

  	  of memory corruption.

  config WANT_PAGE_DEBUG_FLAGS
  	bool
  
  config PAGE_POISONING
  	bool "Debug page memory allocations"
  	depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC
  	depends on !HIBERNATION
  	select DEBUG_PAGEALLOC
  	select WANT_PAGE_DEBUG_FLAGS

  	---help---

  	   Fill the pages with poison patterns after free_pages() and verify
  	   the patterns before alloc_pages(). This results in a large slowdown,

  	   but helps to find certain types of memory corruption.

  	   This option cannot be enabled in combination with hibernation as
  	   that would result in incorrect warnings of memory corruption after
  	   a resume because free pages are not saved to the suspend image.