Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus

[firefly-linux-kernel-4.4.55.git] / mm / Kconfig.debug

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 4b2443254de260d2e05cdecb8d3eea903d91734f..56badfc4810a8a4e70597ce82a0532929e6e6dda 100644 (file)
--- 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---