>> I'd prefer #ifdef rather than #ifndef.
>>
>> so...
>>
>> #ifdef CONFIG_CGROUP_SWAP_RES_CTLR
>>   your definition
>> #else
>>   original definition
>> #endif
>>
> OK.
> I'll change it.

Thanks.


>> and vm_swap_full() isn't page granularity operation.
>> this is memory(or swap) cgroup operation.
>>
>> this argument is slightly odd.
>>
> But what callers of vm_swap_full() know is page,
> not mem_cgroup.
> I don't want to add to callers something like:
>
>  pc = get_page_cgroup(page);
>  mem = pc->mem_cgroup;
>  vm_swap_full(mem);

perhaps, I don't understand your intention exactly.
Why can't you make wrapper function?

e.g.
    vm_swap_full(page_to_memcg(page))
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