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Commit 7bc32f6f authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds
Browse files

mm: debug-pagealloc: fix kconfig dependency warning 



Fix kconfig dependency warning to satisfy dependencies:

warning: (PAGE_POISONING) selects DEBUG_PAGEALLOC which has unmet
direct dependencies (DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC &&
(!HIBERNATION || !PPC && !SPARC) && !KMEMCHECK)

Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1d16871d

mm/Kconfig.debug

+11 −14
Original line number Diff line number Diff line 
config DEBUG_PAGEALLOC

	bool "Debug page memory allocations"

	depends on DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC

	depends on !HIBERNATION || !PPC && !SPARC

	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 "Debug page memory allocations"

	depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC

	depends on !HIBERNATION

	select DEBUG_PAGEALLOC

	bool

	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 corruption.



	   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.