linux-kernel - [PATCH v11 07/19] futex: Create private

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Message-ID: <20250407155742.968816-8-bigeasy@linutronix.de>
Date: Mon,  7 Apr 2025 17:57:30 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v11 07/19] futex: Create private_hash() get/put class

From: Peter Zijlstra <peterz@...radead.org>

This gets us:

  fph = futex_private_hash(key) /* gets fph and inc users */
  futex_private_hash_get(fph)   /* inc users */
  futex_private_hash_put(fph)   /* dec users */

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/futex/core.c  | 12 ++++++++++++
 kernel/futex/futex.h |  8 ++++++++
 2 files changed, 20 insertions(+)

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 56a5653e450cb..6a1d6b14277f4 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -107,6 +107,18 @@ late_initcall(fail_futex_debugfs);
 
 #endif /* CONFIG_FAIL_FUTEX */
 
+struct futex_private_hash *futex_private_hash(void)
+{
+	return NULL;
+}
+
+bool futex_private_hash_get(struct futex_private_hash *fph)
+{
+	return false;
+}
+
+void futex_private_hash_put(struct futex_private_hash *fph) { }
+
 /**
  * futex_hash - Return the hash bucket in the global hash
  * @key:	Pointer to the futex key for which the hash is calculated
diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index 77d9b3509f75c..bc76e366f9a77 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -206,10 +206,18 @@ extern struct futex_hash_bucket *futex_hash(union futex_key *key);
 extern void futex_hash_get(struct futex_hash_bucket *hb);
 extern void futex_hash_put(struct futex_hash_bucket *hb);
 
+extern struct futex_private_hash *futex_private_hash(void);
+extern bool futex_private_hash_get(struct futex_private_hash *fph);
+extern void futex_private_hash_put(struct futex_private_hash *fph);
+
 DEFINE_CLASS(hb, struct futex_hash_bucket *,
 	     if (_T) futex_hash_put(_T),
 	     futex_hash(key), union futex_key *key);
 
+DEFINE_CLASS(private_hash, struct futex_private_hash *,
+	     if (_T) futex_private_hash_put(_T),
+	     futex_private_hash(), void);
+
 /**
  * futex_match - Check whether two futex keys are equal
  * @key1:	Pointer to key1
-- 
2.49.0