linux-kernel - Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update

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Message-Id: <200703040005.38189.arnd@arndb.de>
Date:	Sun, 4 Mar 2007 00:05:37 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	bert hubert <bert.hubert@...herlabs.nl>
Cc:	bryan.wu@...log.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update

On Saturday 03 March 2007 23:50:02 bert hubert wrote:
> >       for (;;)
> >               asm volatile ("idle");
>
> This looks remarkably like relax_cpu()

Actually not: cpu_relax() is defined as barrier(), it can't
call idle because that might make it sleep for a indefinite
amount of time (until the next interrupt, but only if they
are enabled).

Some nice architectures provide a hardware mechanism to do
cpu_relax, like going to low-power mode for a few microseconds,
but this one doesn't seem to have it.

	Arnd <><
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