disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/include/asm-generic/qrwlock.h
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@@ -1,15 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * Queue read/write lock
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  *
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  * (C) Copyright 2013-2014 Hewlett-Packard Development Company, L.P.
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  *
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@@ -71,8 +62,8 @@
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 	if (unlikely(cnts))
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 		return 0;
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-	return likely(atomic_cmpxchg_acquire(&lock->cnts,
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-					     cnts, cnts | _QW_LOCKED) == cnts);
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+	return likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts,
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+				_QW_LOCKED));
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 }
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 /**
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  * queued_read_lock - acquire read lock of a queue rwlock
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@@ -96,8 +87,9 @@
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  */
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 static inline void queued_write_lock(struct qrwlock *lock)
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 {
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+	u32 cnts = 0;
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 	/* Optimize for the unfair lock case where the fair flag is 0. */
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-	if (atomic_cmpxchg_acquire(&lock->cnts, 0, _QW_LOCKED) == 0)
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+	if (likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts, _QW_LOCKED)))
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 		return;
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 	queued_write_lock_slowpath(lock);