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SubjectRedundant memset in AIO read_events
OK, here is another one.  In the top level read_events() function in
fs/aio.c, a struct io_event is instantiated on the stack (variable ent).
It calls aio_read_evt() function which will fill the entire io_event
structure into variable ent. What's the point of zeroing when copy
covers the same memory area? Possible a debug code left around?

- Ken
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