alloc_tag: mark pages reserved during CMA activation as not tagged

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@google.com
Fixes: d224eb0287fb ("codetag: debug: mark codetags for reserved pages as empty")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>	[6.10]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 3ec04933f7fd8a192d3c2681a3803ea167a39949..13eb7cd58d9e21cee6d3a43d2574fc7b7f1604ad 100644 (file)
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -2293,6 +2293,8 @@ void __init init_cma_reserved_pageblock(struct page *page)
 
        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);