Yeah, I also assume that it used to work at some time. Didn't bother to investigate, though. > The code uses debugfs_create_atomic_t(), and atomic_t is signed, so > I'd expect negative numbers to work. In debugfs, it is all cast from unsigned long long to something. Check simple_attr_write() where the value is obtained with kstrtoull. The code fix would be to not use simple_attr, I think. I opted for the doc fix.
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