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1config PAGE_EXTENSION
2	bool "Extend memmap on extra space for more information on page"
3	---help---
4	  Extend memmap on extra space for more information on page. This
5	  could be used for debugging features that need to insert extra
6	  field for every page. This extension enables us to save memory
7	  by not allocating this extra memory according to boottime
8	  configuration.
9
10config DEBUG_PAGEALLOC
11	bool "Debug page memory allocations"
12	depends on DEBUG_KERNEL
13	depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
14	depends on !KMEMCHECK
15	select PAGE_EXTENSION
16	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
17	---help---
18	  Unmap pages from the kernel linear mapping after free_pages().
19	  This results in a large slowdown, but helps to find certain types
20	  of memory corruption.
21
22	  For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
23	  fill the pages with poison patterns after free_pages() and verify
24	  the patterns before alloc_pages().  Additionally,
25	  this option cannot be enabled in combination with hibernation as
26	  that would result in incorrect warnings of memory corruption after
27	  a resume because free pages are not saved to the suspend image.
28
29config PAGE_POISONING
30	bool
31