YAMAMOTO Takashi wrote:
>> Li Zefan wrote:
>>> No need for VM_BUG_ON(pc), since 'pc' is the list entry. This should
>>> be VM_BUG_ON(page).
>>>
>>> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
>>> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>> pc is of type page_cgroup and we use list_for_each_entry_safe_reverse. Not sure
>> why we can't bug on pc.
> 
> pc is dereferenced before this VM_BUG_ON.
> 
> YAMAMOTO Takashi
> 

OK, so the VM_BUG_ON needs to move to an earlier location. Agreed.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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