Re: [PATCH 04/11] ipc: move locking out of ipcctl_pre_down_nolock

From: Andi Kleen
Date: Thu May 16 2013 - 13:55:35 EST

Davidlohr Bueso <davidlohr.bueso@xxxxxx> writes:

> This function currently acquires both the rw_mutex and the rcu lock on
> successful lookups, leaving the callers to explicitly unlock them, creating
> another two level locking situation.

Note that the rcu read lock is not a real lock, so it doesn't have the
usual ordering problems.


ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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