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+config PAGE_EXTENSION
+ bool "Extend memmap on extra space for more information on page"
+ ---help---
+ Extend memmap on extra space for more information on page. This
+ could be used for debugging features that need to insert extra
+ field for every page. This extension enables us to save memory
+ by not allocating this extra memory according to boottime
+ configuration.
+
+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_EXTENSION
+ select PAGE_POISONING 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 PAGE_POISONING
+ bool