linux-kernel - [PATCH v2] ftrace: properly merge notrace hash

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Message-Id: <20250408160258.48563-1-andybnac@gmail.com>
Date: Wed,  9 Apr 2025 00:02:57 +0800
From: Andy Chiu <andybnac@...il.com>
To: rostedt@...dmis.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: mark.rutland@....com,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	Andy Chiu <andybnac@...il.com>,
	bjorn@...osinc.com,
	puranjay12@...il.com,
	alexghiti@...osinc.com,
	paul.walmsley@...ive.com,
	greentime.hu@...ive.com,
	nick.hu@...ive.com,
	nylon.chen@...ive.com,
	eric.lin@...ive.com,
	vincent.chen@...ive.com,
	zong.li@...ive.com,
	yongxuan.wang@...ive.com,
	samuel.holland@...ive.com,
	olivia.chu@...ive.com,
	c2232430@...il.com
Subject: [PATCH v2] ftrace: properly merge notrace hash

The global notrace hash should be jointly decided by the intersection of
each subops's notrace hash, but not the filter hash.

Fixes: 5fccc7552ccb ("ftrace: Add subops logic to allow one ops to manage many")
Signed-off-by: Andy Chiu <andybnac@...il.com>
---
Changelog v2:
- free both filter and notrace hash when intersect_hash() fails
---
 kernel/trace/ftrace.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1a48aedb5255..bb9e1bf4fe86 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3526,16 +3526,16 @@ int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int
 	    ftrace_hash_empty(subops->func_hash->notrace_hash)) {
 		notrace_hash = EMPTY_HASH;
 	} else {
-		size_bits = max(ops->func_hash->filter_hash->size_bits,
-				subops->func_hash->filter_hash->size_bits);
+		size_bits = max(ops->func_hash->notrace_hash->size_bits,
+				subops->func_hash->notrace_hash->size_bits);
 		notrace_hash = alloc_ftrace_hash(size_bits);
 		if (!notrace_hash) {
-			free_ftrace_hash(filter_hash);
+			free_ftrace_hash(notrace_hash);
 			return -ENOMEM;
 		}
 
-		ret = intersect_hash(&notrace_hash, ops->func_hash->filter_hash,
-				     subops->func_hash->filter_hash);
+		ret = intersect_hash(&notrace_hash, ops->func_hash->notrace_hash,
+				     subops->func_hash->notrace_hash);
 		if (ret < 0) {
 			free_ftrace_hash(filter_hash);
 			free_ftrace_hash(notrace_hash);
-- 
2.39.3 (Apple Git-145)