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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/preempt.h
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@@ -26,13 +26,13 @@
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  *         PREEMPT_MASK:	0x000000ff
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  *         SOFTIRQ_MASK:	0x0000ff00
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  *         HARDIRQ_MASK:	0x000f0000
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- *             NMI_MASK:	0x00100000
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+ *             NMI_MASK:	0x00f00000
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  * PREEMPT_NEED_RESCHED:	0x80000000
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  */
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 #define PREEMPT_BITS	8
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 #define SOFTIRQ_BITS	8
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 #define HARDIRQ_BITS	4
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-#define NMI_BITS	1
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+#define NMI_BITS	4
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 #define PREEMPT_SHIFT	0
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 #define SOFTIRQ_SHIFT	(PREEMPT_SHIFT + PREEMPT_BITS)
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@@ -52,9 +52,6 @@
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 #define NMI_OFFSET	(1UL << NMI_SHIFT)
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 #define SOFTIRQ_DISABLE_OFFSET	(2 * SOFTIRQ_OFFSET)
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-
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-/* We use the MSB mostly because its available */
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-#define PREEMPT_NEED_RESCHED	0x80000000
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55
 
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 #define PREEMPT_DISABLED	(PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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@@ -185,7 +182,7 @@
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 #define preemptible()	(preempt_count() == 0 && !irqs_disabled())
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-#ifdef CONFIG_PREEMPT
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+#ifdef CONFIG_PREEMPTION
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 #define preempt_enable() \
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 do { \
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 	barrier(); \
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@@ -206,7 +203,7 @@
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 		__preempt_schedule(); \
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 } while (0)
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-#else /* !CONFIG_PREEMPT */
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+#else /* !CONFIG_PREEMPTION */
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 #define preempt_enable() \
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 do { \
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 	barrier(); \
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@@ -220,7 +217,7 @@
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 } while (0)
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 #define preempt_check_resched() do { } while (0)
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-#endif /* CONFIG_PREEMPT */
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+#endif /* CONFIG_PREEMPTION */
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 #define preempt_disable_notrace() \
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 do { \
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@@ -325,4 +322,34 @@
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 #endif
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+/**
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+ * migrate_disable - Prevent migration of the current task
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+ *
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+ * Maps to preempt_disable() which also disables preemption. Use
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+ * migrate_disable() to annotate that the intent is to prevent migration,
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+ * but not necessarily preemption.
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+ *
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+ * Can be invoked nested like preempt_disable() and needs the corresponding
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+ * number of migrate_enable() invocations.
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+ */
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+static __always_inline void migrate_disable(void)
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+{
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+	preempt_disable();
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+}
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+
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+/**
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+ * migrate_enable - Allow migration of the current task
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+ *
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+ * Counterpart to migrate_disable().
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+ *
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+ * As migrate_disable() can be invoked nested, only the outermost invocation
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+ * reenables migration.
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+ *
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+ * Currently mapped to preempt_enable().
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+ */
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+static __always_inline void migrate_enable(void)
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+{
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+	preempt_enable();
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+}
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+
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 #endif /* __LINUX_PREEMPT_H */