The patch titled
Subject: alloc_tag: mark pages reserved during CMA activation as not tagged
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
alloc_tag-mark-pages-reserved-during-cma-activation-as-not-tagged.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/alloc_tag-mark-pages-reserved-during-cma-activation-as-not-tagged.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: alloc_tag: mark pages reserved during CMA activation as not tagged
Date: Tue, 13 Aug 2024 08:07:57 -0700
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>
---
mm/mm_init.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/mm_init.c~alloc_tag-mark-pages-reserved-during-cma-activation-as-not-tagged
+++ a/mm/mm_init.c
@@ -2244,6 +2244,8 @@ 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 -mm which might be from surenb@xxxxxxxxxx are
alloc_tag-introduce-clear_page_tag_ref-helper-function.patch
alloc_tag-mark-pages-reserved-during-cma-activation-as-not-tagged.patch
