Re: [PATCH] Avoid calling down_read and down_write during startup

[Benjamin LaHaise]

On Thu, Feb 23, 2006 at 05:36:56PM -0500, Alan Stern wrote:
> This patch (as660) changes the registration and unregistration routines 
> for blocking notifier chains.  During system startup, when task switching 
> is illegal, the routines will avoid calling down_write().

Why is that necessary?  The down_write() will immediately succeed as no 
other process can possibly be holding the lock when the system is booting, 
so the special casing doesn't fix anything.

		-ben
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