From: Tim Hockin <thockin@hockin.org>
To: RANDAZZO@ddc-web.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: FW: spinlocks dont work
Date: Fri, 13 Feb 2004 13:34:45 -0800 [thread overview]
Message-ID: <20040213213445.GA23759@hockin.org> (raw)
In-Reply-To: <89760D3F308BD41183B000508BAFAC4104B16F74@DDCNYNTD>
On Fri, Feb 13, 2004 at 04:12:08PM -0500, RANDAZZO@ddc-web.com wrote:
> On a uniprocessor system, with config_smp NOT Defined...
>
> Note the following example:
>
> driver 'A' calls spin_lock_irqsave and gets through (but does not call
> ..unlock).
> driver 'B' calls spin_lock_irqsave and gets through???
>
> How can B get through if A did not unlock yet?
Because actual mutexing is a no-op without CONFIG_SMP. What you have is a BUG.
Don't do that.
next prev parent reply other threads:[~2004-02-13 21:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-13 21:12 FW: spinlocks dont work RANDAZZO
2004-02-13 21:34 ` Tim Hockin [this message]
2004-02-13 22:41 ` Brian Gerst
2004-02-14 1:22 ` Jamie Lokier
2004-02-14 1:26 ` Jamie Lokier
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