quoted

"*_memcg = memcg" should be executed when "memcg_charge_kmem" is success.
"memcg_charge_kmem" return 0 if success in charging.
Therefore, I think this code is wrong.
If I am right, it is a serious bug that affect behavior of all the patchset.

Which is precisely what it does. ret is a boolean, that will be true
when charge succeeded (== 0 test)

Ahh...Okay! I didn't see (== 0 test)

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