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SubjectRe: Sysfs attributes racing with unregistration

On Wed, Jan 04, 2012 at 01:13:41PM -0500, Alan Stern wrote:
> Now, looking through the code, I wonder why sysfs_{get,put}_active()
> and sysfs_deactivate() don't use a real rwsem. Why go to all the
> effort of imitating one? Is it just to save space?

Hmmm... maybe there was something which prevented that or maybe I was
just being stupid. I don't really remember. Space is a fairly
important consideration too. Depending on configuration, there can be
a LOT of sysfs_dirents and memory consumption from sysfs has been a
real problem.



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