3 files changed, 69 insertions, 10 deletions

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index f1e79263fe61..23b8cba4a2a3 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -898,6 +898,37 @@ err:
 	return rc;
 }
 
+static unsigned int cpu_map_shared_cache(bool online, unsigned int cpu,
+					 cpumask_t **map)
+{
+	struct cacheinfo *llc, *sib_llc;
+	unsigned int sibling;
+
+	if (!last_level_cache_is_valid(cpu))
+		return 0;
+
+	llc = per_cpu_cacheinfo_idx(cpu, cache_leaves(cpu) - 1);
+
+	if (llc->type != CACHE_TYPE_DATA && llc->type != CACHE_TYPE_UNIFIED)
+		return 0;
+
+	if (online) {
+		*map = &llc->shared_cpu_map;
+		return cpumask_weight(*map);
+	}
+
+	/* shared_cpu_map of offlined CPU will be cleared, so use sibling map */
+	for_each_cpu(sibling, &llc->shared_cpu_map) {
+		if (sibling == cpu || !last_level_cache_is_valid(sibling))
+			continue;
+		sib_llc = per_cpu_cacheinfo_idx(sibling, cache_leaves(sibling) - 1);
+		*map = &sib_llc->shared_cpu_map;
+		return cpumask_weight(*map);
+	}
+
+	return 0;
+}
+
 /*
  * Calculate the size of the per-CPU data cache slice.  This can be
  * used to estimate the size of the data cache slice that can be used
@@ -929,28 +960,31 @@ static void update_per_cpu_data_slice_size_cpu(unsigned int cpu)
 		ci->per_cpu_data_slice_size = llc->size / nr_shared;
 }
 
-static void update_per_cpu_data_slice_size(bool cpu_online, unsigned int cpu)
+static void update_per_cpu_data_slice_size(bool cpu_online, unsigned int cpu,
+					   cpumask_t *cpu_map)
 {
 	unsigned int icpu;
 
-	for_each_online_cpu(icpu) {
+	for_each_cpu(icpu, cpu_map) {
 		if (!cpu_online && icpu == cpu)
 			continue;
 		update_per_cpu_data_slice_size_cpu(icpu);
+		setup_pcp_cacheinfo(icpu);
 	}
 }
 
 static int cacheinfo_cpu_online(unsigned int cpu)
 {
 	int rc = detect_cache_attributes(cpu);
+	cpumask_t *cpu_map;
 
 	if (rc)
 		return rc;
 	rc = cache_add_dev(cpu);
 	if (rc)
 		goto err;
-	update_per_cpu_data_slice_size(true, cpu);
-	setup_pcp_cacheinfo();
+	if (cpu_map_shared_cache(true, cpu, &cpu_map))
+		update_per_cpu_data_slice_size(true, cpu, cpu_map);
 	return 0;
 err:
 	free_cache_attributes(cpu);
@@ -959,12 +993,16 @@ err:
 
 static int cacheinfo_cpu_pre_down(unsigned int cpu)
 {
+	cpumask_t *cpu_map;
+	unsigned int nr_shared;
+
+	nr_shared = cpu_map_shared_cache(false, cpu, &cpu_map);
 	if (cpumask_test_and_clear_cpu(cpu, &cache_dev_map))
 		cpu_cache_sysfs_exit(cpu);
 
 	free_cache_attributes(cpu);
-	update_per_cpu_data_slice_size(false, cpu);
-	setup_pcp_cacheinfo();
+	if (nr_shared > 1)
+		update_per_cpu_data_slice_size(false, cpu, cpu_map);
 	return 0;
 }
 
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 0b33e81f9c9b..f5a6bffce518 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -144,7 +144,7 @@ static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
 #endif /* CONFIG_HOTPLUG_CPU */
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 #include <linux/kexec.h>
 
 static ssize_t crash_notes_show(struct device *dev,
@@ -189,14 +189,14 @@ static const struct attribute_group crash_note_cpu_attr_group = {
 #endif
 
 static const struct attribute_group *common_cpu_attr_groups[] = {
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 	&crash_note_cpu_attr_group,
 #endif
 	NULL
 };
 
 static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 	&crash_note_cpu_attr_group,
 #endif
 	NULL
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 14f964a7719b..c0436f46cfb7 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -188,6 +188,7 @@ static int memory_block_online(struct memory_block *mem)
 	unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
 	unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
 	unsigned long nr_vmemmap_pages = 0;
+	struct memory_notify arg;
 	struct zone *zone;
 	int ret;
 
@@ -207,9 +208,19 @@ static int memory_block_online(struct memory_block *mem)
 	if (mem->altmap)
 		nr_vmemmap_pages = mem->altmap->free;
 
+	arg.altmap_start_pfn = start_pfn;
+	arg.altmap_nr_pages = nr_vmemmap_pages;
+	arg.start_pfn = start_pfn + nr_vmemmap_pages;
+	arg.nr_pages = nr_pages - nr_vmemmap_pages;
 	mem_hotplug_begin();
+	ret = memory_notify(MEM_PREPARE_ONLINE, &arg);
+	ret = notifier_to_errno(ret);
+	if (ret)
+		goto out_notifier;
+
 	if (nr_vmemmap_pages) {
-		ret = mhp_init_memmap_on_memory(start_pfn, nr_vmemmap_pages, zone);
+		ret = mhp_init_memmap_on_memory(start_pfn, nr_vmemmap_pages,
+						zone, mem->altmap->inaccessible);
 		if (ret)
 			goto out;
 	}
@@ -231,7 +242,11 @@ static int memory_block_online(struct memory_block *mem)
 					  nr_vmemmap_pages);
 
 	mem->zone = zone;
+	mem_hotplug_done();
+	return ret;
 out:
+	memory_notify(MEM_FINISH_OFFLINE, &arg);
+out_notifier:
 	mem_hotplug_done();
 	return ret;
 }
@@ -244,6 +259,7 @@ static int memory_block_offline(struct memory_block *mem)
 	unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
 	unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
 	unsigned long nr_vmemmap_pages = 0;
+	struct memory_notify arg;
 	int ret;
 
 	if (!mem->zone)
@@ -275,6 +291,11 @@ static int memory_block_offline(struct memory_block *mem)
 		mhp_deinit_memmap_on_memory(start_pfn, nr_vmemmap_pages);
 
 	mem->zone = NULL;
+	arg.altmap_start_pfn = start_pfn;
+	arg.altmap_nr_pages = nr_vmemmap_pages;
+	arg.start_pfn = start_pfn + nr_vmemmap_pages;
+	arg.nr_pages = nr_pages - nr_vmemmap_pages;
+	memory_notify(MEM_FINISH_OFFLINE, &arg);
 out:
 	mem_hotplug_done();
 	return ret;