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Date: Mon, 21 Feb 2022 16:45:31 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michal Hocko <mhocko@...e.com>,
Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v1] drivers/base/memory: clarify adding and removing of memory blocks
Let's make it clearer at which places we actually add and remove memory
blocks -- streamlining the terminology -- and highlight which memory
block start out online and which start out as offline.
* rename add_memory_block -> add_boot_memory_block
* rename init_memory_block -> add_memory_block
* rename unregister_memory -> remove_memory_block
* rename register_memory -> __add_memory_block
* add add_hotplug_memory_block
* mark add_boot_memory_block with __init (suggested by Oscar)
__add_memory_block() is a pure helper for add_memory_block(), remove
the somewhat obvious comment.
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Oscar Salvador <osalvador@...e.de>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
Based on v5.17-rc5 and:
[PATCH v2 0/2] drivers/base/memory: determine and store zone for
single-zone memory blocks [1]
[1] https://lkml.kernel.org/r/20220210184359.235565-1-david@redhat.com
---
drivers/base/memory.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 5297c8a84428..c7dfd86e960f 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -617,11 +617,7 @@ static const struct attribute_group *memory_memblk_attr_groups[] = {
NULL,
};
-/*
- * register_memory - Setup a sysfs device for a memory block
- */
-static
-int register_memory(struct memory_block *memory)
+static int __add_memory_block(struct memory_block *memory)
{
int ret;
@@ -721,9 +717,9 @@ void memory_block_add_nid(struct memory_block *mem, int nid,
}
#endif
-static int init_memory_block(unsigned long block_id, unsigned long state,
- unsigned long nr_vmemmap_pages,
- struct memory_group *group)
+static int add_memory_block(unsigned long block_id, unsigned long state,
+ unsigned long nr_vmemmap_pages,
+ struct memory_group *group)
{
struct memory_block *mem;
int ret = 0;
@@ -754,7 +750,7 @@ static int init_memory_block(unsigned long block_id, unsigned long state,
mem->zone = early_node_zone_for_memory_block(mem, NUMA_NO_NODE);
#endif /* CONFIG_NUMA */
- ret = register_memory(mem);
+ ret = __add_memory_block(mem);
if (ret)
return ret;
@@ -766,7 +762,7 @@ static int init_memory_block(unsigned long block_id, unsigned long state,
return 0;
}
-static int add_memory_block(unsigned long base_section_nr)
+static int __init add_boot_memory_block(unsigned long base_section_nr)
{
int section_count = 0;
unsigned long nr;
@@ -778,11 +774,18 @@ static int add_memory_block(unsigned long base_section_nr)
if (section_count == 0)
return 0;
- return init_memory_block(memory_block_id(base_section_nr),
- MEM_ONLINE, 0, NULL);
+ return add_memory_block(memory_block_id(base_section_nr),
+ MEM_ONLINE, 0, NULL);
+}
+
+static int add_hotplug_memory_block(unsigned long block_id,
+ unsigned long nr_vmemmap_pages,
+ struct memory_group *group)
+{
+ return add_memory_block(block_id, MEM_OFFLINE, nr_vmemmap_pages, group);
}
-static void unregister_memory(struct memory_block *memory)
+static void remove_memory_block(struct memory_block *memory)
{
if (WARN_ON_ONCE(memory->dev.bus != &memory_subsys))
return;
@@ -821,8 +824,7 @@ int create_memory_block_devices(unsigned long start, unsigned long size,
return -EINVAL;
for (block_id = start_block_id; block_id != end_block_id; block_id++) {
- ret = init_memory_block(block_id, MEM_OFFLINE, vmemmap_pages,
- group);
+ ret = add_hotplug_memory_block(block_id, vmemmap_pages, group);
if (ret)
break;
}
@@ -833,7 +835,7 @@ int create_memory_block_devices(unsigned long start, unsigned long size,
mem = find_memory_block_by_id(block_id);
if (WARN_ON_ONCE(!mem))
continue;
- unregister_memory(mem);
+ remove_memory_block(mem);
}
}
return ret;
@@ -862,7 +864,7 @@ void remove_memory_block_devices(unsigned long start, unsigned long size)
if (WARN_ON_ONCE(!mem))
continue;
unregister_memory_block_under_nodes(mem);
- unregister_memory(mem);
+ remove_memory_block(mem);
}
}
@@ -922,7 +924,7 @@ void __init memory_dev_init(void)
*/
for (nr = 0; nr <= __highest_present_section_nr;
nr += sections_per_block) {
- ret = add_memory_block(nr);
+ ret = add_boot_memory_block(nr);
if (ret)
panic("%s() failed to add memory block: %d\n", __func__,
ret);
--
2.35.1
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