[PATCH] mm: Disable DEFERRED_STRUCT_PAGE_INIT on !NO_BOOTMEM

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

When we have !NO_BOOTMEM, the deferred page struct initialization
doesn't work well because the pages reserved in bootmem are released
to the page allocator uncoditionally. It causes memory corruption
and system crash eventually.

As Mel suggested, the bootmem is retiring slowly. We fix the issue
by simply hiding DEFERRED_STRUCT_PAGE_INIT when bootmem is enabled.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
 mm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 989f8f3..646cf9f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -626,7 +626,7 @@ config DEFERRED_STRUCT_PAGE_INIT
 	bool "Defer initialisation of struct pages to kthreads"
 	default n
 	depends on ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
-	depends on MEMORY_HOTPLUG
+	depends on NO_BOOTMEM && MEMORY_HOTPLUG
 	help
 	  Ordinarily all struct pages are initialised during early boot in a
 	  single thread. On very large machines this can take a considerable
-- 
2.1.0

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