3 files changed, 45 insertions, 11 deletions

diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h
index 7fd2838..5d4505f 100644
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -16,9 +16,11 @@
  */
 #include <linux/percpu.h>
 
-typedef __printf(1, 0) int (*printk_func_t)(const char *fmt, va_list args);
+typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt,
+					    va_list args);
 
-int __printf(1, 0) vprintk_default(const char *fmt, va_list args);
+__printf(2, 0)
+int vprintk_default(int level, const char *fmt, va_list args);
 
 #ifdef CONFIG_PRINTK_NMI
 
@@ -31,9 +33,10 @@ extern raw_spinlock_t logbuf_lock;
  * via per-CPU variable.
  */
 DECLARE_PER_CPU(printk_func_t, printk_func);
-static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args)
+__printf(2, 0)
+static inline int vprintk_func(int level, const char *fmt, va_list args)
 {
-	return this_cpu_read(printk_func)(fmt, args);
+	return this_cpu_read(printk_func)(level, fmt, args);
 }
 
 extern atomic_t nmi_message_lost;
@@ -44,9 +47,10 @@ static inline int get_nmi_message_lost(void)
 
 #else /* CONFIG_PRINTK_NMI */
 
-static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args)
+__printf(2, 0)
+static inline int vprintk_func(int level, const char *fmt, va_list args)
 {
-	return vprintk_default(fmt, args);
+	return vprintk_default(level, fmt, args);
 }
 
 static inline int get_nmi_message_lost(void)
diff --git a/kernel/printk/nmi.c b/kernel/printk/nmi.c
index b69eb8a..bc3eeb1 100644
--- a/kernel/printk/nmi.c
+++ b/kernel/printk/nmi.c
@@ -58,7 +58,7 @@ static DEFINE_PER_CPU(struct nmi_seq_buf, nmi_print_seq);
  * one writer running. But the buffer might get flushed from another
  * CPU, so we need to be careful.
  */
-static int vprintk_nmi(const char *fmt, va_list args)
+static int vprintk_nmi(int level, const char *fmt, va_list args)
 {
 	struct nmi_seq_buf *s = this_cpu_ptr(&nmi_print_seq);
 	int add = 0;
@@ -79,7 +79,16 @@ again:
 	if (!len)
 		smp_rmb();
 
-	add = vsnprintf(s->buffer + len, sizeof(s->buffer) - len, fmt, args);
+	if (level != LOGLEVEL_DEFAULT) {
+		add = snprintf(s->buffer + len, sizeof(s->buffer) - len,
+				KERN_SOH "%c", '0' + level);
+		add += vsnprintf(s->buffer + len + add,
+				 sizeof(s->buffer) - len - add,
+				 fmt, args);
+	} else {
+		add = vsnprintf(s->buffer + len, sizeof(s->buffer) - len,
+				fmt, args);
+	}
 
 	/*
 	 * Do it once again if the buffer has been flushed in the meantime.
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 09af62e..d2accf2 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1801,7 +1801,28 @@ asmlinkage int printk_emit(int facility, int level,
 }
 EXPORT_SYMBOL(printk_emit);
 
-int vprintk_default(const char *fmt, va_list args)
+#ifdef CONFIG_PRINTK
+#define define_pr_level(func, loglevel)				\
+asmlinkage __visible void func(const char *fmt, ...)		\
+{								\
+	va_list args;						\
+								\
+	va_start(args, fmt);					\
+	vprintk_default(loglevel, fmt, args);			\
+	va_end(args);						\
+}								\
+EXPORT_SYMBOL(func)
+
+define_pr_level(__pr_emerg, LOGLEVEL_EMERG);
+define_pr_level(__pr_alert, LOGLEVEL_ALERT);
+define_pr_level(__pr_crit, LOGLEVEL_CRIT);
+define_pr_level(__pr_err, LOGLEVEL_ERR);
+define_pr_level(__pr_warn, LOGLEVEL_WARNING);
+define_pr_level(__pr_notice, LOGLEVEL_NOTICE);
+define_pr_level(__pr_info, LOGLEVEL_INFO);
+#endif
+
+int vprintk_default(int level, const char *fmt, va_list args)
 {
 	int r;
 
@@ -1811,7 +1832,7 @@ int vprintk_default(const char *fmt, va_list args)
 		return r;
 	}
 #endif
-	r = vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args);
+	r = vprintk_emit(0, level, NULL, 0, fmt, args);
 
 	return r;
 }
@@ -1844,7 +1865,7 @@ asmlinkage __visible int printk(const char *fmt, ...)
 	int r;
 
 	va_start(args, fmt);
-	r = vprintk_func(fmt, args);
+	r = vprintk_func(LOGLEVEL_DEFAULT, fmt, args);
 	va_end(args);
 
 	return r;