On Mon, May 23, 2016 at 06:38:31PM -0300, Fabio Estevam wrote:

On Mon, May 23, 2016 at 6:07 PM, Russell King - ARM Linux
[off-list ref] wrote:

quoted

Read the code again.  There's three states:

1. CONFIG_SMP=n - it always returns false.
2. CONFIG_SMP=y, CONFIG_SMP_ON_UP=n - it always returns true.  Such a
   kernel can _only_ be run on SMP capable systems.
3. CONFIG_SMP=y, CONFIG_SMP_ON_UP=y - it returns depending on whether
   we detect that the CPU is SMP capable.

Yes, I meant that on imx6ul we have option 2 above with imx_v6_v7_defconfig.

I don't think so, unless you specifically turn off CONFIG_SMP_ON_UP.
It defaults to 'y', so imx_v6_v7_defconfig should result in this being
'y'.

Also tested option 3 and is_smp() returns true as well.

So that means the MPIDR register is telling the kernel...

* The boot CPU has multiprocessor extensions.
* The boot CPU is not part of a uniprocessor system.

I will try to see why GIC on this SoC cannot work in SMP.

-- 
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