linux-kernel - [PATCH 2.6.20-rc1] fix vm_events_fold

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Date:	Fri, 15 Dec 2006 12:06:10 +0900
From:	Magnus Damm <damm@...nsource.se>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Magnus Damm <damm@...nsource.se>,
	Christoph Lameter <clameter@....com>
Subject: [PATCH 2.6.20-rc1] fix vm_events_fold_cpu() build breakage

fix vm_events_fold_cpu() build breakage

2.6.20-rc1 does not build properly if CONFIG_VM_EVENT_COUNTERS is set
and CONFIG_HOTPLUG is unset:

  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
mm/built-in.o: In function `page_alloc_cpu_notify':
page_alloc.c:(.text+0x56eb): undefined reference to `vm_events_fold_cpu'
make: *** [.tmp_vmlinux1] Error 1

Signed-Off-By: Magnus Damm <magnus@...inux.co.jp>
---

 Applies on top of linux-2.6.20-rc1.

 include/linux/vmstat.h |    4 ++++
 1 file changed, 4 insertions(+)

--- 0001/include/linux/vmstat.h
+++ 0003/include/linux/vmstat.h	2006-12-15 11:46:23.000000000 +0900
@@ -73,7 +73,11 @@ static inline void count_vm_events(enum 
 }
 
 extern void all_vm_events(unsigned long *);
+#ifdef CONFIG_HOTPLUG
 extern void vm_events_fold_cpu(int cpu);
+#else
+#define vm_events_fold_cpu(x)	do { } while (0)
+#endif
 
 #else
 
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