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hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/kernel/printk/internal.h
..
..
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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+/*
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+ * internal.h - printk internal definitions
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+ */
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+#include <linux/percpu.h>
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+
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+#ifdef CONFIG_PRINTK
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+
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+#define PRINTK_SAFE_CONTEXT_MASK	0x007ffffff
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+#define PRINTK_NMI_DIRECT_CONTEXT_MASK	0x008000000
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+#define PRINTK_NMI_CONTEXT_MASK		0xff0000000
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+
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+#define PRINTK_NMI_CONTEXT_OFFSET	0x010000000
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+
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+extern raw_spinlock_t logbuf_lock;
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+
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+__printf(4, 0)
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+int vprintk_store(int facility, int level,
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+		  const struct dev_printk_info *dev_info,
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+		  const char *fmt, va_list args);
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+
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+__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
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+__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
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+__printf(1, 0) int vprintk_func(const char *fmt, va_list args);
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+void __printk_safe_enter(void);
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+void __printk_safe_exit(void);
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+
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+void printk_safe_init(void);
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+bool printk_percpu_data_ready(void);
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+
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+#define printk_safe_enter_irqsave(flags)	\
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+	do {					\
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+		local_irq_save(flags);		\
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+		__printk_safe_enter();		\
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+	} while (0)
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+
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+#define printk_safe_exit_irqrestore(flags)	\
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+	do {					\
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+		__printk_safe_exit();		\
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+		local_irq_restore(flags);	\
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+	} while (0)
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+
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+#define printk_safe_enter_irq()		\
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+	do {					\
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+		local_irq_disable();		\
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+		__printk_safe_enter();		\
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+	} while (0)
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+
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+#define printk_safe_exit_irq()			\
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+	do {					\
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+		__printk_safe_exit();		\
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+		local_irq_enable();		\
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+	} while (0)
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+
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+void defer_console_output(void);
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+
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+#else
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+
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+__printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
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+
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+/*
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+ * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
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+ * semaphore and some of console functions (console_unlock()/etc.), so
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+ * printk-safe must preserve the existing local IRQ guarantees.
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+ */
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+#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
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+#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
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+
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+#define printk_safe_enter_irq() local_irq_disable()
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+#define printk_safe_exit_irq() local_irq_enable()
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+
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+static inline void printk_safe_init(void) { }
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+static inline bool printk_percpu_data_ready(void) { return false; }
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+#endif /* CONFIG_PRINTK */