linux-kernel - [PATCH 2/3] lib: reuse page_ext_data() to obtain codetag

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Message-ID: <20240711220457.1751071-2-surenb@google.com>
Date: Thu, 11 Jul 2024 15:04:56 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, vbabka@...e.cz, pasha.tatashin@...een.com, 
	souravpanda@...gle.com, keescook@...omium.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, surenb@...gle.com
Subject: [PATCH 2/3] lib: reuse page_ext_data() to obtain codetag_ref

codetag_ref_from_page_ext() reimplements the same calculation as
page_ext_data(). Reuse existing function instead.

Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging")
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/pgalloc_tag.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index 9cacadbd61f8..acb1e9ce7981 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -15,7 +15,7 @@ extern struct page_ext_operations page_alloc_tagging_ops;
 
 static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext)
 {
-	return (void *)page_ext + page_alloc_tagging_ops.offset;
+	return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops);
 }
 
 static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref)
-- 
2.45.2.993.g49e7a77208-goog