linux-kernel - Re: [patch 2.6.24-rc2 1/3] generic gpio -- gpio

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Message-ID: <20071113093414.GA5270@elte.hu>
Date:	Tue, 13 Nov 2007 10:34:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Florian Fainelli <florian.fainelli@...ecomint.eu>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [patch 2.6.24-rc2 1/3] generic gpio -- gpio_chip support


* David Brownell <david-b@...bell.net> 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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