linux-kernel - [PATCH 4/5] tools headers: Synchronize prctl.h ABI header

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Message-ID: <20250516160339.1022507-5-bigeasy@linutronix.de>
Date: Fri, 16 May 2025 18:03:38 +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 4/5] tools headers: Synchronize prctl.h ABI header

The prctl.h ABI header was slightly updated during the development of
the interface. In particular the "immutable" parameter became a bit in
the option argument.

Synchronize prctl.h ABI header again and make use of the definition in
the testsuite.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 tools/include/uapi/linux/prctl.h               |  1 +
 .../futex/functional/futex_priv_hash.c         | 18 +++++++++---------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/prctl.h
index 21f30b3ded74b..43dec6eed559a 100644
--- a/tools/include/uapi/linux/prctl.h
+++ b/tools/include/uapi/linux/prctl.h
@@ -367,6 +367,7 @@ struct prctl_mm_map {
 /* FUTEX hash management */
 #define PR_FUTEX_HASH			78
 # define PR_FUTEX_HASH_SET_SLOTS	1
+# define FH_FLAG_IMMUTABLE		(1ULL << 0)
 # define PR_FUTEX_HASH_GET_SLOTS	2
 # define PR_FUTEX_HASH_GET_IMMUTABLE	3
 
diff --git a/tools/testing/selftests/futex/functional/futex_priv_hash.c b/tools/testing/selftests/futex/functional/futex_priv_hash.c
index 72a621d9313f3..32abd9acdf186 100644
--- a/tools/testing/selftests/futex/functional/futex_priv_hash.c
+++ b/tools/testing/selftests/futex/functional/futex_priv_hash.c
@@ -30,9 +30,9 @@ static int counter;
 # define PR_FUTEX_HASH_GET_IMMUTABLE	3
 #endif
 
-static int futex_hash_slots_set(unsigned int slots, int immutable)
+static int futex_hash_slots_set(unsigned int slots, int flags)
 {
-	return prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS, slots, immutable);
+	return prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS, slots, flags);
 }
 
 static int futex_hash_slots_get(void)
@@ -63,11 +63,11 @@ static void futex_hash_slots_set_verify(int slots)
 	ksft_test_result_pass("SET and GET slots %d passed\n", slots);
 }
 
-static void futex_hash_slots_set_must_fail(int slots, int immutable)
+static void futex_hash_slots_set_must_fail(int slots, int flags)
 {
 	int ret;
 
-	ret = futex_hash_slots_set(slots, immutable);
+	ret = futex_hash_slots_set(slots, flags);
 	ksft_test_result(ret < 0, "futex_hash_slots_set(%d, %d)\n",
 			 slots, immutable);
 }
@@ -254,18 +254,18 @@ int main(int argc, char *argv[])
 		ret = futex_hash_slots_set(0, 0);
 		ksft_test_result(ret == 0, "Global hash request\n");
 	} else {
-		ret = futex_hash_slots_set(4, 1);
+		ret = futex_hash_slots_set(4, FH_FLAG_IMMUTABLE);
 		ksft_test_result(ret == 0, "Immutable resize to 4\n");
 	}
 	if (ret != 0)
 		goto out;
 
 	futex_hash_slots_set_must_fail(4, 0);
-	futex_hash_slots_set_must_fail(4, 1);
+	futex_hash_slots_set_must_fail(4, FH_FLAG_IMMUTABLE);
 	futex_hash_slots_set_must_fail(8, 0);
-	futex_hash_slots_set_must_fail(8, 1);
-	futex_hash_slots_set_must_fail(0, 1);
-	futex_hash_slots_set_must_fail(6, 1);
+	futex_hash_slots_set_must_fail(8, FH_FLAG_IMMUTABLE);
+	futex_hash_slots_set_must_fail(0, FH_FLAG_IMMUTABLE);
+	futex_hash_slots_set_must_fail(6, FH_FLAG_IMMUTABLE);
 
 	ret = pthread_barrier_init(&barrier_main, NULL, MAX_THREADS);
 	if (ret != 0) {
-- 
2.49.0