config DEBUG_PAGEALLOC bool "Debug page memory allocations" depends on DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC depends on !HIBERNATION || !PPC && !SPARC ---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 corruptions. config WANT_PAGE_DEBUG_FLAGS bool config PAGE_POISONING bool "Debug page memory allocations" depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC depends on !HIBERNATION select DEBUG_PAGEALLOC select WANT_PAGE_DEBUG_FLAGS help Fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions. This option cannot enalbe with hibernation. Otherwise, it will get wrong messages for memory corruption because the free pages are not saved to the suspend image.