[linux.git] / mm / Kconfig.debug

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
	---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
Commit	Line	Data
ee3b4290 AM	1	config DEBUG_PAGEALLOC
ee3b4290 AM	2	bool "Debug page memory allocations"
7bc32f6f AM	3	depends on DEBUG_KERNEL
7bc32f6f AM	4	depends on !HIBERNATION \|\| ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
7d46d9e6	5	depends on !KMEMCHECK
7bc32f6f	6	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
ee3b4290 AM	7	---help---
	8	Unmap pages from the kernel linear mapping after free_pages().
	9	This results in a large slowdown, but helps to find certain types
22f8b458	10	of memory corruption.
ee3b4290	11
7bc32f6f AM	12	For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
	13	fill the pages with poison patterns after free_pages() and verify
	14	the patterns before alloc_pages(). Additionally,
	15	this option cannot be enabled in combination with hibernation as
	16	that would result in incorrect warnings of memory corruption after
	17	a resume because free pages are not saved to the suspend image.
	18
6a11f75b AM	19	config WANT_PAGE_DEBUG_FLAGS
	20	bool
	21
	22	config PAGE_POISONING
7bc32f6f	23	bool
6a11f75b	24	select WANT_PAGE_DEBUG_FLAGS