Re: [PATCH] vfs: Speed up deactivate_super for non-modularfilesystems

[Al Viro]

On Mon, May 07, 2012 at 02:51:08PM -0700, Eric W. Biederman wrote:

> /proc and similar non-modular filesystems do not need a rcu_barrier
> in deactivate_locked_super.  Being non-modular there is no danger
> of the rcu callback running after the module is unloaded.

There's more than just a module unload there, though - actual freeing
struct super_block also happens past that rcu_barrier()...
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