mm/codetag: fix arg in pgalloc_tag_copy alloc_tag_sub

alloc_tag_sub() takes bytes as opposed to number of pages as argument.

Currently pgalloc_tag_copy() passes the number of pages.  This fix passes
the correct unit, which is the number of bytes allocated.

Link: https://lkml.kernel.org/r/20241022232440.334820-1-souravpanda@google.com
Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()")
Signed-off-by: Sourav Panda <souravpanda@google.com>
Acked-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4570f33e2429a89eaaf43ba5a436608d7f174352..eb070c14e309955884d4eb3be69f490a60afb5ba 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4207,7 +4207,7 @@ static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
        /* Clear the old ref to the original allocation tag. */
        clear_page_tag_ref(&old->page);
        /* Decrement the counters of the tag on get_new_folio. */
-       alloc_tag_sub(ref, folio_nr_pages(new));
+       alloc_tag_sub(ref, folio_size(new));
 
        __alloc_tag_ref_set(ref, tag);