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Date: Sat, 23 Feb 2002 14:40:58 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: yodaiken@fsmlabs.com
CC: Roman Zippel <zippel@linux-m68k.org>, Robert Love <rml@tech9.net>,
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Subject: Re: [PATCH] only irq-safe atomic ops
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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.

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