X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=mm%2FKconfig.debug;h=56badfc4810a8a4e70597ce82a0532929e6e6dda;hb=d0bffab0439fb7edaee09677b636eef5991e8b80;hp=4b2443254de260d2e05cdecb8d3eea903d91734f;hpb=98961a7e431735c791dbaaf0337029e219a5db5a;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 4b2443254de2..56badfc4810a 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -1,8 +1,18 @@
+config PAGE_EXTENSION
+	bool "Extend memmap on extra space for more information on page"
+	---help---
+	  Extend memmap on extra space for more information on page. This
+	  could be used for debugging features that need to insert extra
+	  field for every page. This extension enables us to save memory
+	  by not allocating this extra memory according to boottime
+	  configuration.
+
 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_EXTENSION
 	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	---help---