Merge tag 'driver-core-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are two small driver core cacheinfo fixes for 6.4-rc5 that
  resolve a number of reported issues with that file. These changes have
  been in linux-next this past week with no reported problems"

* tag 'driver-core-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  drivers: base: cacheinfo: Update cpu_map_populated during CPU Hotplug
  drivers: base: cacheinfo: Fix shared_cpu_map changes in event of CPU hotplug

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index bba3482ddeb82..cbae8be1fe520 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -388,6 +388,16 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
 				continue;/* skip if itself or no cacheinfo */
 			for (sib_index = 0; sib_index < cache_leaves(i); sib_index++) {
 				sib_leaf = per_cpu_cacheinfo_idx(i, sib_index);
+
+				/*
+				 * Comparing cache IDs only makes sense if the leaves
+				 * belong to the same cache level of same type. Skip
+				 * the check if level and type do not match.
+				 */
+				if (sib_leaf->level != this_leaf->level ||
+				    sib_leaf->type != this_leaf->type)
+					continue;
+
 				if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
 					cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
 					cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
@@ -400,11 +410,14 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
 			coherency_max_size = this_leaf->coherency_line_size;
 	}
 
+	/* shared_cpu_map is now populated for the cpu */
+	this_cpu_ci->cpu_map_populated = true;
 	return 0;
 }
 
 static void cache_shared_cpu_map_remove(unsigned int cpu)
 {
+	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 	struct cacheinfo *this_leaf, *sib_leaf;
 	unsigned int sibling, index, sib_index;
 
@@ -419,6 +432,16 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
 
 			for (sib_index = 0; sib_index < cache_leaves(sibling); sib_index++) {
 				sib_leaf = per_cpu_cacheinfo_idx(sibling, sib_index);
+
+				/*
+				 * Comparing cache IDs only makes sense if the leaves
+				 * belong to the same cache level of same type. Skip
+				 * the check if level and type do not match.
+				 */
+				if (sib_leaf->level != this_leaf->level ||
+				    sib_leaf->type != this_leaf->type)
+					continue;
+
 				if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
 					cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
 					cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
@@ -427,6 +450,9 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
 			}
 		}
 	}
+
+	/* cpu is no longer populated in the shared map */
+	this_cpu_ci->cpu_map_populated = false;
 }
 
 static void free_cache_attributes(unsigned int cpu)