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