linux-kernel - [PATCH 2/5] alloc_tag: eliminate alloc_tag_ref

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Message-ID: <20240819151512.2363698-3-surenb@google.com>
Date: Mon, 19 Aug 2024 08:15:08 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: akpm@...ux-foundation.org
Cc: kent.overstreet@...ux.dev, corbet@....net, arnd@...db.de, 
	mcgrof@...nel.org, rppt@...nel.org, paulmck@...nel.org, thuth@...hat.com, 
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	linux-modules@...r.kernel.org, kernel-team@...roid.com, surenb@...gle.com
Subject: [PATCH 2/5] alloc_tag: eliminate alloc_tag_ref_set

To simplify further refactoring, open-code the only two callers
of alloc_tag_ref_set().

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/linux/alloc_tag.h   | 25 ++-----------------------
 include/linux/pgalloc_tag.h | 12 +++++++++++-
 2 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h
index 99cbc7f086ad..21e3098220e3 100644
--- a/include/linux/alloc_tag.h
+++ b/include/linux/alloc_tag.h
@@ -143,36 +143,15 @@ static inline void alloc_tag_add_check(union codetag_ref *ref, struct alloc_tag
 static inline void alloc_tag_sub_check(union codetag_ref *ref) {}
 #endif
 
-/* Caller should verify both ref and tag to be valid */
-static inline void __alloc_tag_ref_set(union codetag_ref *ref, struct alloc_tag *tag)
-{
-	ref->ct = &tag->ct;
-	/*
-	 * We need in increment the call counter every time we have a new
-	 * allocation or when we split a large allocation into smaller ones.
-	 * Each new reference for every sub-allocation needs to increment call
-	 * counter because when we free each part the counter will be decremented.
-	 */
-	this_cpu_inc(tag->counters->calls);
-}
-
-static inline void alloc_tag_ref_set(union codetag_ref *ref, struct alloc_tag *tag)
-{
-	alloc_tag_add_check(ref, tag);
-	if (!ref || !tag)
-		return;
-
-	__alloc_tag_ref_set(ref, tag);
-}
-
 static inline void alloc_tag_add(union codetag_ref *ref, struct alloc_tag *tag, size_t bytes)
 {
 	alloc_tag_add_check(ref, tag);
 	if (!ref || !tag)
 		return;
 
-	__alloc_tag_ref_set(ref, tag);
+	ref->ct = &tag->ct;
 	this_cpu_add(tag->counters->bytes, bytes);
+	this_cpu_inc(tag->counters->calls);
 }
 
 static inline void alloc_tag_sub(union codetag_ref *ref, size_t bytes)
diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index 207f0c83c8e9..244a328dff62 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -103,7 +103,17 @@ static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 	page_ext = page_ext_next(page_ext);
 	for (i = 1; i < nr; i++) {
 		/* Set new reference to point to the original tag */
-		alloc_tag_ref_set(codetag_ref_from_page_ext(page_ext), tag);
+		ref = codetag_ref_from_page_ext(page_ext);
+		alloc_tag_add_check(ref, tag);
+		if (ref) {
+			ref->ct = &tag->ct;
+			/*
+			 * We need in increment the call counter every time we split a
+			 * large allocation into smaller ones because when we free each
+			 * part the counter will be decremented.
+			 */
+			this_cpu_inc(tag->counters->calls);
+		}
 		page_ext = page_ext_next(page_ext);
 	}
 out:
-- 
2.46.0.184.g6999bdac58-goog