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: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 14 deletions

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index af7cfb43d2f0..8b1a477162dc 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -1,27 +1,24 @@
 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.