Subject: linux-next: manual merge of the risc-v tree with the arm64 tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 13 Aug 2019 09:34:47 +1000

Hi all,

Today's linux-next merge of the risc-v tree got a conflict in:

  arch/arm64/kernel/topology.c

between commit:

  98dc19902a0b ("arm64: topology: Use PPTT to determine if PE is a thread")

from the arm64 tree and commit:

  60c1b220d8bc ("cpu-topology: Move cpu topology code to common code.")

from the risc-v tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/arm64/kernel/topology.c
index 6106c49f84bc,6b95c91e7d67..000000000000
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@@ -296,72 -59,21 +59,32 @@@ topology_populated
  	update_siblings_masks(cpuid);
  }
  
- static void clear_cpu_topology(int cpu)
- {
- 	struct cpu_topology *cpu_topo = &cpu_topology[cpu];
- 
- 	cpumask_clear(&cpu_topo->llc_sibling);
- 	cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
- 
- 	cpumask_clear(&cpu_topo->core_sibling);
- 	cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
- 	cpumask_clear(&cpu_topo->thread_sibling);
- 	cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
- }
- 
- static void __init reset_cpu_topology(void)
- {
- 	unsigned int cpu;
- 
- 	for_each_possible_cpu(cpu) {
- 		struct cpu_topology *cpu_topo = &cpu_topology[cpu];
- 
- 		cpu_topo->thread_id = -1;
- 		cpu_topo->core_id = 0;
- 		cpu_topo->package_id = -1;
- 		cpu_topo->llc_id = -1;
- 
- 		clear_cpu_topology(cpu);
- 	}
- }
- 
- void remove_cpu_topology(unsigned int cpu)
- {
- 	int sibling;
- 
- 	for_each_cpu(sibling, topology_core_cpumask(cpu))
- 		cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
- 	for_each_cpu(sibling, topology_sibling_cpumask(cpu))
- 		cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
- 	for_each_cpu(sibling, topology_llc_cpumask(cpu))
- 		cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
- 
- 	clear_cpu_topology(cpu);
- }
- 
  #ifdef CONFIG_ACPI
 +static bool __init acpi_cpu_is_threaded(int cpu)
 +{
 +	int is_threaded = acpi_pptt_cpu_is_thread(cpu);
 +
 +	/*
 +	 * if the PPTT doesn't have thread information, assume a homogeneous
 +	 * machine and return the current CPU's thread state.
 +	 */
 +	if (is_threaded < 0)
 +		is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
 +
 +	return !!is_threaded;
 +}
 +
  /*
   * Propagate the topology information of the processor_topology_node tree to the
   * cpu_topology array.
   */
- static int __init parse_acpi_topology(void)
+ int __init parse_acpi_topology(void)
  {
 -	bool is_threaded;
  	int cpu, topology_id;
  
+ 	if (acpi_disabled)
+ 		return 0;
+ 
 -	is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
 -
  	for_each_possible_cpu(cpu) {
  		int i, cache_id;