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Re: smp/non-smp kernel


On 3/8/07, Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
On Tue, 2007-03-06 at 11:25 +0000, my linux wrote:
> Hi,
>
> How can I know  whether my machine booted with SMP and non-SMP
> kernel ?   ( from kernel space)

that sounds like a weird thing to care about; drivers or anything but
deep architecture code really shouldn't have this knowledge!

(for example preempt kernels basically make you have the same rules as
smp anyway)


#ifdef CONFIG_SMP
        lock_kernel();
#endif

#ifdef CONFIG_PREEMPT
        preempt_disable();
#endif

Is equivalant to

        lock_kernel();
        preempt_disable();

in UP/SMP and preempt/non-preempt configuration ?

-mln