Balbir Singh wrote:
> 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 <[EMAIL PROTECTED]>
>>>> Acked-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
>>> 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.
>
No, 'pc' has been dereferenced in list_for_each_entry_safe_reverse().
#define list_for_each_entry_safe_reverse(pos, n, head, member) \
for (pos = list_entry((head)->prev, typeof(*pos), member), \
n = list_entry(pos->member.prev, typeof(*pos), member); \
^^^^^^^^^^^
&pos->member != (head); \
^^^^^^^^^^^
pos = n, n = list_entry(n->member.prev, typeof(*n), member))
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