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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 <>

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 *);
extern void vm_events_fold_cpu(int cpu);
+#define vm_events_fold_cpu(x) do { } while (0)


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