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