Benjamin LaHaise <[email protected]> wrote:
>
> 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.
down_write() unconditionally (and reasonably) does local_irq_enable() in
the uncontended case. And enabling local interrupts early in boot can
cause crashes.
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