From: Suren Baghdasaryan <surenb@xxxxxxxxxx> commit 766c163c2068b45330664fb67df67268e588a22d upstream. During CMA activation, pages in CMA area are prepared and then freed without being allocated. This triggers warnings when memory allocation debug config (CONFIG_MEM_ALLOC_PROFILING_DEBUG) is enabled. Fix this by marking these pages not tagged before freeing them. Link: https://lkml.kernel.org/r/20240813150758.855881-2-surenb@xxxxxxxxxx Fixes: d224eb0287fb ("codetag: debug: mark codetags for reserved pages as empty") Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> Acked-by: David Hildenbrand <david@xxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx> Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Sourav Panda <souravpanda@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [6.10] Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/mm_init.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2293,6 +2293,8 @@ void __init init_cma_reserved_pageblock( set_pageblock_migratetype(page, MIGRATE_CMA); set_page_refcounted(page); + /* pages were reserved and not allocated */ + clear_page_tag_ref(page); __free_pages(page, pageblock_order); adjust_managed_page_count(page, pageblock_nr_pages); Patches currently in stable-queue which might be from surenb@xxxxxxxxxx are queue-6.10/alloc_tag-introduce-clear_page_tag_ref-helper-function.patch queue-6.10/alloc_tag-mark-pages-reserved-during-cma-activation-as-not-tagged.patch
