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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/arch/arm64/include/asm/spinlock.h
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@@ -1,17 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Copyright (C) 2012 ARM Ltd.
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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 version 2 as
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- * published by the Free Software Foundation.
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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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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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 #ifndef __ASM_SPINLOCK_H
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 #define __ASM_SPINLOCK_H
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@@ -22,4 +11,17 @@
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 /* See include/linux/spinlock.h */
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 #define smp_mb__after_spinlock()	smp_mb()
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13
 
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+/*
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+ * Changing this will break osq_lock() thanks to the call inside
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+ * smp_cond_load_relaxed().
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+ *
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+ * See:
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+ * https://lore.kernel.org/lkml/20200110100612.GC2827@hirez.programming.kicks-ass.net
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+ */
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+#define vcpu_is_preempted vcpu_is_preempted
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+static inline bool vcpu_is_preempted(int cpu)
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+{
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+	return false;
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+}
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+
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 #endif /* __ASM_SPINLOCK_H */