1 files changed, 20 insertions, 7 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
index 602033acd6c7..f38b07f78a4e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -206,12 +206,11 @@ __setup("log_buf_len=", log_buf_len_setup);
 #ifdef CONFIG_BOOT_PRINTK_DELAY
 
 static unsigned int boot_delay; /* msecs delay after each printk during bootup */
-static unsigned long long printk_delay_msec; /* per msec, based on boot_delay */
+static unsigned long long loops_per_msec;       /* based on boot_delay */
 
 static int __init boot_delay_setup(char *str)
 {
         unsigned long lpj;
-        unsigned long long loops_per_msec;
 
         lpj = preset_lpj ? preset_lpj : 1000000;        /* some guess */
         loops_per_msec = (unsigned long long)lpj / 1000 * HZ;
@@ -220,10 +219,9 @@ static int __init boot_delay_setup(char *str)
         if (boot_delay > 10 * 1000)
                 boot_delay = 0;
 
-        printk_delay_msec = loops_per_msec;
-        printk(KERN_DEBUG "boot_delay: %u, preset_lpj: %ld, lpj: %lu, "
-                "HZ: %d, printk_delay_msec: %llu\n",
-                boot_delay, preset_lpj, lpj, HZ, printk_delay_msec);
+        pr_debug("boot_delay: %u, preset_lpj: %ld, lpj: %lu, "
+                "HZ: %d, loops_per_msec: %llu\n",
+                boot_delay, preset_lpj, lpj, HZ, loops_per_msec);
         return 1;
 }
 __setup("boot_delay=", boot_delay_setup);
@@ -236,7 +234,7 @@ static void boot_delay_msec(void)
         if (boot_delay == 0 || system_state != SYSTEM_BOOTING)
                 return;
 
-        k = (unsigned long long)printk_delay_msec * boot_delay;
+        k = (unsigned long long)loops_per_msec * boot_delay;
 
         timeout = jiffies + msecs_to_jiffies(boot_delay);
         while (k) {
@@ -655,6 +653,20 @@ static int recursion_bug;
 static int new_text_line = 1;
 static char printk_buf[1024];
 
+int printk_delay_msec __read_mostly;
+
+static inline void printk_delay(void)
+{
+        if (unlikely(printk_delay_msec)) {
+                int m = printk_delay_msec;
+
+                while (m--) {
+                        mdelay(1);
+                        touch_nmi_watchdog();
+                }
+        }
+}
+
 asmlinkage int vprintk(const char *fmt, va_list args)
 {
         int printed_len = 0;
@@ -664,6 +676,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
         char *p;
 
         boot_delay_msec();
+        printk_delay();
 
         preempt_disable();
         /* This stops the holder of console_sem just where we want him */