[PATCH] hwpoison: fix build failure

[Ingo Molnar]

Today's -tip fails to build due to upstream commit
1a9b5b7fe0c5dad8a635288882d36785dea742f9 ("mm: export stable
page flags")  (authored and merged yesterday) causing the
following build failure on x86  when CONFIG_PROC_PAGE_MONITOR is
disabled:

 mm/built-in.o: In function `hwpoison_filter':
  (.text+0x39fbf): undefined reference to `stable_page_flags'

The bug is that the stable_page_flags() API is only available
under  CONFIG_PROC_PAGE_MONITOR, but utilized in
mm/memory-failure.c unconditionally.

I've applied the patch below to -tip for now, which expresses
this dependency  in the Kconfig. (Eventually a cleaner solution
would be to factor such ABI  details out of procfs, they dont
belong there.)

Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Matt Mackall <mpm@xxxxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Fr??d??ric Weisbecker <fweisbec@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
LKML-Reference: <20091217094041.GA24708@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 mm/Kconfig |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 43ea8c3..021bc12 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -243,6 +243,8 @@ config ARCH_SUPPORTS_MEMORY_FAILURE
 config MEMORY_FAILURE
 	depends on MMU
 	depends on ARCH_SUPPORTS_MEMORY_FAILURE
+	depends on PROC_FS
+	select PROC_PAGE_MONITOR
 	bool "Enable recovery from hardware memory errors"
 	help
 	  Enables code to recover from some memory failures on systems
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