linux-kernel - [PATCH 08/12] unwind: Simplify unwind_user

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Message-ID: <20250924080119.271671514@infradead.org>
Date: Wed, 24 Sep 2025 09:59:56 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: jpoimboe@...nel.org,
 rostedt@...nel.org
Cc: linux-kernel@...r.kernel.org,
 peterz@...radead.org
Subject: [PATCH 08/12] unwind: Simplify unwind_user_faultable()


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/unwind/deferred.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/kernel/unwind/deferred.c
+++ b/kernel/unwind/deferred.c
@@ -128,17 +128,15 @@ int unwind_user_faultable(struct unwind_
 
 	cache = info->cache;
 	trace->entries = cache->entries;
-
-	if (cache->nr_entries) {
+	trace->nr = cache->nr_entries;
+	if (trace->nr) {
 		/*
 		 * The user stack has already been previously unwound in this
 		 * entry context.  Skip the unwind and use the cache.
 		 */
-		trace->nr = cache->nr_entries;
 		return 0;
 	}
 
-	trace->nr = 0;
 	unwind_user(trace, UNWIND_MAX_ENTRIES);
 
 	cache->nr_entries = trace->nr;