[v7,1/3] mm/memory_hotplug: replace an open-coded kmemdup() in add_memory_resource()

Commit Message

Verma, Vishal L Oct. 25, 2023, 10:44 p.m. UTC

A review of the memmap_on_memory modifications to add_memory_resource()
revealed an instance of an open-coded kmemdup(). Replace it with
kmemdup().

Cc: Andrew Morton <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Dan Williams <[e-mail]>
Reported-by: Dan Williams <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
Signed-off-by: Vishal Verma <[e-mail]>
---
 mm/memory_hotplug.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index f8d3e7427e32..6be7de9efa55 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1439,11 +1439,11 @@  int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
 	if (mhp_flags & MHP_MEMMAP_ON_MEMORY) {
 		if (mhp_supports_memmap_on_memory(size)) {
 			mhp_altmap.free = memory_block_memmap_on_memory_pages();
-			params.altmap = kmalloc(sizeof(struct vmem_altmap), GFP_KERNEL);
+			params.altmap = kmemdup(&mhp_altmap,
+						sizeof(struct vmem_altmap),
+						GFP_KERNEL);
 			if (!params.altmap)
 				goto error;
-
-			memcpy(params.altmap, &mhp_altmap, sizeof(mhp_altmap));
 		}
 		/* fallback to not using altmap  */
 	}