On Fri, 2007-03-09 at 06:20 +0000, my linux wrote: > > 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 ? no, in fact your ifdefs are really incorrect. the kernel makes those things no-ops IF THEY ARE. But your lock_kernel() ifdef for example is really wrong if preempt is enabled! (also, don't use lock_kernel() in new code anyway) -- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
