Re: [patch 2.6.24-rc2 1/3] generic gpio -- gpio_chip support

From: Ingo Molnar
Date: Tue Nov 13 2007 - 04:38:27 EST



* David Brownell <david-b@xxxxxxxxxxx> wrote:

> > > I speculate that either the design has changed (without fanfare),
> > > or else that stuff is in RT kernels and has not yet gone upstream.
> >
> > Well whatever. We shouldn't have to resort to caller-side party
> > tricks like this to get acceptable performance.
>
> I'd be happy if, as originally presented, it were possible to just
> pass a raw_spinlock_t to spin_lock_irqsave() and friends.

that's a spinlock type abstraction of PREEMPT_RT, not of mainline. In
mainline there's basically almost never any valid reason to use a raw
spinlock - please use spinlock_t instead. Why do you want to use
raw_spinlock_t?

Ingo
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