mm/codetag: uninline and move pgalloc_tag_copy and pgalloc_tag_split

pgalloc_tag_copy() and pgalloc_tag_split() are sizable and outside of any
performance-critical paths, so it should be fine to uninline them.  Also
move their declarations into pgalloc_tag.h which seems like a more
appropriate place for them.  No functional changes other than uninlining.

Link: https://lkml.kernel.org/r/20241024162318.1640781-1-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Yu Zhao <yuzhao@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Sourav Panda <souravpanda@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: surenbaghdasaryan

include/linux/mm.h

@@ -4166,62 +4166,4 @@ static inline int do_mseal(unsigned long start, size_t len_in, unsigned long fla
 }
 #endif
 
-#ifdef CONFIG_MEM_ALLOC_PROFILING
-static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order)
-{
-	int i;
-	struct alloc_tag *tag;
-	unsigned int nr_pages = 1 << new_order;
-
-	if (!mem_alloc_profiling_enabled())
-		return;
-
-	tag = pgalloc_tag_get(&folio->page);
-	if (!tag)
-		return;
-
-	for (i = nr_pages; i < (1 << old_order); i += nr_pages) {
-		union pgtag_ref_handle handle;
-		union codetag_ref ref;
-
-		if (get_page_tag_ref(folio_page(folio, i), &ref, &handle)) {
-			/* Set new reference to point to the original tag */
-			alloc_tag_ref_set(&ref, tag);
-			update_page_tag_ref(handle, &ref);
-			put_page_tag_ref(handle);
-		}
-	}
-}
-
-static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
-{
-	union pgtag_ref_handle handle;
-	union codetag_ref ref;
-	struct alloc_tag *tag;
-
-	tag = pgalloc_tag_get(&old->page);
-	if (!tag)
-		return;
-
-	if (!get_page_tag_ref(&new->page, &ref, &handle))
-		return;
-
-	/* 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_size(new));
-	__alloc_tag_ref_set(&ref, tag);
-	update_page_tag_ref(handle, &ref);
-	put_page_tag_ref(handle);
-}
-#else /* !CONFIG_MEM_ALLOC_PROFILING */
-static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order)
-{
-}
-
-static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
-{
-}
-#endif /* CONFIG_MEM_ALLOC_PROFILING */
-
 #endif /* _LINUX_MM_H */

include/linux/pgalloc_tag.h

@@ -230,6 +230,9 @@ static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr)
 		this_cpu_sub(tag->counters->bytes, PAGE_SIZE * nr);
 }
 
+void pgalloc_tag_split(struct folio *folio, int old_order, int new_order);
+void pgalloc_tag_copy(struct folio *new, struct folio *old);
+
 void __init alloc_tag_sec_init(void);
 
 #else /* CONFIG_MEM_ALLOC_PROFILING */
@@ -241,6 +244,8 @@ static inline void pgalloc_tag_sub(struct page *page, unsigned int nr) {}
 static inline struct alloc_tag *pgalloc_tag_get(struct page *page) { return NULL; }
 static inline void pgalloc_tag_sub_pages(struct alloc_tag *tag, unsigned int nr) {}
 static inline void alloc_tag_sec_init(void) {}
+static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order) {}
+static inline void pgalloc_tag_copy(struct folio *new, struct folio *old) {}
 
 #endif /* CONFIG_MEM_ALLOC_PROFILING */
 

lib/alloc_tag.c

@@ -163,6 +163,54 @@ size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sl
 	return nr;
 }
 
+void pgalloc_tag_split(struct folio *folio, int old_order, int new_order)
+{
+	int i;
+	struct alloc_tag *tag;
+	unsigned int nr_pages = 1 << new_order;
+
+	if (!mem_alloc_profiling_enabled())
+		return;
+
+	tag = pgalloc_tag_get(&folio->page);
+	if (!tag)
+		return;
+
+	for (i = nr_pages; i < (1 << old_order); i += nr_pages) {
+		union pgtag_ref_handle handle;
+		union codetag_ref ref;
+
+		if (get_page_tag_ref(folio_page(folio, i), &ref, &handle)) {
+			/* Set new reference to point to the original tag */
+			alloc_tag_ref_set(&ref, tag);
+			update_page_tag_ref(handle, &ref);
+			put_page_tag_ref(handle);
+		}
+	}
+}
+
+void pgalloc_tag_copy(struct folio *new, struct folio *old)
+{
+	union pgtag_ref_handle handle;
+	union codetag_ref ref;
+	struct alloc_tag *tag;
+
+	tag = pgalloc_tag_get(&old->page);
+	if (!tag)
+		return;
+
+	if (!get_page_tag_ref(&new->page, &ref, &handle))
+		return;
+
+	/* 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_size(new));
+	__alloc_tag_ref_set(&ref, tag);
+	update_page_tag_ref(handle, &ref);
+	put_page_tag_ref(handle);
+}
+
 static void shutdown_mem_profiling(bool remove_file)
 {
 	if (mem_alloc_profiling_enabled())