>> +extern unsigned long ksm_zero_pages;
>> +
>> +static inline void ksm_notify_unmap_zero_page(pte_t pte)
>> +{
>> + if (is_ksm_zero_pte(pte))
>> + ksm_zero_pages--;
>> +}
>> +
>> static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
>> {
>> int ret;
>> @@ -103,6 +111,10 @@ static inline void ksm_exit(struct mm_struct *mm)
>>
>> #define is_ksm_zero_pte(pte) 0
>>
>> +static inline void ksm_notify_unmap_zero_page(pte_t pte)
>> +{
>> +}
>> +
>
>Having proposed that name ... I realize that we call this function
>whenever there might be a zeropage mapped (when we have !page after
>vm_normal_page()) -- but it could also not be the zeropage.
>
>Not really able to come up with a better name :)
>
>ksm_notify_maybe_unmap_zero_page ?
>
>ksm_maybe_unmap_zero_page ?
>
Analogous to the existing name of ksm_might_need_to_copy, so maybe we can use
'ksm_might_unmap_zero_page',
>
>Maybe someone else reading along has a better idea. In any case, the
>logic itself LGTM
