config DEBUG_PAGEALLOC
  	bool "Debug page memory allocations"

  	depends on DEBUG_KERNEL
  	depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC

  	depends on !KMEMCHECK

  	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC

  	select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC

  	---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.

  	  For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
  	  fill the pages with poison patterns after free_pages() and verify
  	  the patterns before alloc_pages().  Additionally,
  	  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.

  config WANT_PAGE_DEBUG_FLAGS
  	bool
  
  config PAGE_POISONING

  	bool

  	select WANT_PAGE_DEBUG_FLAGS

  
  config PAGE_GUARD
  	bool
  	select WANT_PAGE_DEBUG_FLAGS