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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/bottom_half.h
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@@ -4,7 +4,7 @@
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 #include <linux/preempt.h>
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-#ifdef CONFIG_TRACE_IRQFLAGS
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+#if defined(CONFIG_PREEMPT_RT) || defined(CONFIG_TRACE_IRQFLAGS)
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 extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
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 #else
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 static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
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@@ -32,4 +32,10 @@
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 	__local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
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 }
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+#ifdef CONFIG_PREEMPT_RT
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+extern bool local_bh_blocked(void);
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+#else
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+static inline bool local_bh_blocked(void) { return false; }
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+#endif
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+
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 #endif /* _LINUX_BH_H */