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Theodore Ts'o authored
Pavel Roskin pointed out that kmemcheck indicated that ext4_mb_store_history() was accessing uninitialized values of ac->ac_tail and ac->ac_buddy leading to garbage in the mballoc history. Fix this by initializing the entire structure to all zeros first. Also, two fields were getting doubly initialized by the caller of ext4_mb_initialize_context, so remove them for efficiency's sake. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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