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Date: Sat, 23 Feb 2002 15:48:06 -0700
From: yodaiken@fsmlabs.com
To: Andrew Morton <akpm@zip.com.au>
Cc: yodaiken@fsmlabs.com, Roman Zippel <zippel@linux-m68k.org>,
        Robert Love <rml@tech9.net>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] only irq-safe atomic ops
Message-ID: <20020223154806.A4272@hq.fsmlabs.com>
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In-Reply-To: <3C781A7A.24B59934@zip.com.au>; from akpm@zip.com.au on Sat, Feb 23, 2002 at 02:40:58PM -0800
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On Sat, Feb 23, 2002 at 02:40:58PM -0800, Andrew Morton wrote:
> yodaiken@fsmlabs.com wrote:
> > 
> > Is this part of some scheme to make the GPL support model actually
> > pay?
> 
> No, no, no.  It's all the uncommented code which brings in the dollars.
>  
> >         c = smp_get_cpuid(); // disables preemption
> > 
> >         ...
> >         f(); // oops, me forgotee, this function also references cpuid
> >         ..
> >         x = ++local_cache[c]; // live dangerously
> >         smp_put_cpuid(); // G_d knows what that does now.
> > 
> 
> preempt_disable() nests.   It's not a problem.

Ah, got the reference count already! Good progress.
Is it irq safe yet?


BTW: Robert, whats a good kernel version that you recommend with
preemption patch? I want to rerun some tests.

-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
 www.fsmlabs.com  www.rtlinux.com

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