[PATCH v3 02/16] ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id

Sudeep KarkadaNagesha Sudeep.KarkadaNagesha at arm.com
Mon Jul 22 07:32:13 EDT 2013

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>

OF/DT core library now provides architecture specific hook to match the
logical cpu index with the corresponding physical identifier. Most of the
cpu DT node parsing and initialisation is contained in devtree.c. So it's
better to define ARM specific arch_match_cpu_phys_id there.

This mainly helps to avoid replication of the code doing CPU node parsing
and physical(MPIDR) to logical mapping.

Cc: Russell King <linux at arm.linux.org.uk>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Acked-by: Rob Herring <rob.herring at calxeda.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>
 arch/arm/kernel/devtree.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 5859c8b..2ee8a17 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -169,6 +169,11 @@ void __init arm_dt_init_cpu_maps(void)
+bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
+	return (phys_id & MPIDR_HWID_BITMASK) == cpu_logical_map(cpu);
  * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
  * @dt_phys: physical address of dt blob

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