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SubjectRe: [PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct
> So, introduce a new rwlock in mm_struct to protect the concurrent access
> to arg_start|end and env_start|end.

I don't think an rwlock makes much sense here. There is almost no
concurrency on the read side, and an rwlock is more expensive than
a spinlock. Just use a spinlock.

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