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PRINTK(9)			 Driver Basics			     PRINTK(9)

       printk - print a kernel message

       int printk(const char * fmt, ...);

	   format string

	   variable arguments

       This is printk. It can be called from any context. We want it to work.

       We try to grab the console_lock. If we succeed, it's easy - we log the
       output and call the console drivers. If we fail to get the semaphore,
       we place the output into the log buffer and return. The current holder
       of the console_sem will notice the new output in console_unlock; and
       will send it to the consoles before releasing the lock.

       One effect of this deferred printing is that code which calls printk
       and then changes console_loglevel may break. This is because
       console_loglevel is inspected when the actual printing occurs.


       See the vsnprintf documentation for format string extensions over C99.

Kernel Hackers Manual 3.8.	   June 2014			     PRINTK(9)

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