[PATCH] ARM: kernel: respect device tree status of cpu nodes
sboyd at codeaurora.org
Wed Mar 5 15:33:07 EST 2014
On 02/24/14 03:22, Jürg Billeter wrote:
> Skip 'disabled' cpu nodes when building the cpu logical map. This avoids
> booting cpus that have been disabled in the device tree.
> Signed-off-by: Jürg Billeter <j at bitron.ch>
> Reviewed-by: Ben Dooks <ben.dooks at codethink.co.uk>
> arch/arm/kernel/devtree.c | 4 ++++
> 1 file changed, 4 insertions(+)
> diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
> index 739c3df..9aed299 100644
> --- a/arch/arm/kernel/devtree.c
> +++ b/arch/arm/kernel/devtree.c
> @@ -95,6 +95,10 @@ void __init arm_dt_init_cpu_maps(void)
> if (of_node_cmp(cpu->type, "cpu"))
> + /* Check if CPU is enabled */
> + if (!of_device_is_available(cpu))
> + continue;
> pr_debug(" * %s...\n", cpu->full_name);
> * A device tree containing CPU nodes with missing "reg"
This doesn't follow the ePAPR spec. According to ePAPR status="disabled"
in a cpu node means "the cpu is in a quiescent state" and one can enable
it by using the "enable-method". At the least, we should document this
in bindings/arm/cpus.txt if we can all agree that we want this
definition of disabled.
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