Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       printk - print a kernel message

SYNOPSIS

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

ARGUMENTS

       fmt    format string

       ...    variable arguments

DESCRIPTION

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

       We try to grab the console_sem. 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 release_console_sem and
       will send it to the consoles before releasing the semaphore.

       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 ALSO

       printf(3)