powerpc/perf: Use cpumask_intersects api for checking disable path

First online CPU in the node disables the nest counters by
making an OPAL call. Any other CPU in that node, will bail out.

Instead of using a temporary mask to find out if any cpu in the
node is visited or not, it is better to use the cpumask_intersects
api to achieve the same.

Similarly a temporary cpumask is used to check if a core is already part
of core_imc_cpumask. Use the same cpumask_intersects api there.

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Reviewed-by: Yury Norov <ynorov@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260427044715.559137-4-sshegde@linux.ibm.com

Author: Shrikanth Hegde

arch/powerpc/perf/imc-pmu.c

@@ -421,7 +421,6 @@ static int ppc_nest_imc_cpu_offline(unsigned int cpu)
 static int ppc_nest_imc_cpu_online(unsigned int cpu)
 {
 	const struct cpumask *l_cpumask;
-	static struct cpumask tmp_mask;
 	int res;
 
 	/* Get the cpumask of this node */
@@ -431,7 +430,7 @@ static int ppc_nest_imc_cpu_online(unsigned int cpu)
 	 * If this is not the first online CPU on this node, then
 	 * just return.
 	 */
-	if (cpumask_and(&tmp_mask, l_cpumask, &nest_imc_cpumask))
+	if (cpumask_intersects(l_cpumask, &nest_imc_cpumask))
 		return 0;
 
 	/*
@@ -647,14 +646,13 @@ static bool is_core_imc_mem_inited(int cpu)
 static int ppc_core_imc_cpu_online(unsigned int cpu)
 {
 	const struct cpumask *l_cpumask;
-	static struct cpumask tmp_mask;
 	int ret = 0;
 
 	/* Get the cpumask for this core */
 	l_cpumask = cpu_sibling_mask(cpu);
 
 	/* If a cpu for this core is already set, then, don't do anything */
-	if (cpumask_and(&tmp_mask, l_cpumask, &core_imc_cpumask))
+	if (cpumask_intersects(l_cpumask, &core_imc_cpumask))
 		return 0;
 
 	if (!is_core_imc_mem_inited(cpu)) {