Re: [PATCH 2/4] Convert epoll to a bitlock

[Andrew Morton]

On Mon,  2 Feb 2009 11:20:09 -0700
Jonathan Corbet <corbet@xxxxxxx> wrote:

> Matt Mackall suggested converting epoll's ep_lock to a bitlock as a way of
> saving space in struct file.  This patch makes that change.

hrm.  bit_spin_lock() makes people upset (large penguiny people).  iirc
it doesn't have all the correct/well-understood memory/compiler
ordering semantics which spinlocks have.  And lockdep doesn't know about
it.

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