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snd_printk(9) [centos man page]

SND_PRINTK(9)						      Miscellaneous Functions						     SND_PRINTK(9)

NAME
snd_printk - printk wrapper SYNOPSIS
snd_printk(fmt, args...); ARGUMENTS
fmt format string args... variable arguments DESCRIPTION
Works like printk but prints the file and the line of the caller when configured with CONFIG_SND_VERBOSE_PRINTK. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SND_PRINTK(9)

Check Out this Related Man Page

TRACE_PRINTK(9) 						   Driver Basics						   TRACE_PRINTK(9)

NAME
trace_printk - printf formatting in the ftrace buffer SYNOPSIS
trace_printk(fmt, ...); ARGUMENTS
fmt the printf format for printing ... variable arguments NOTE
__trace_printk is an internal function for trace_printk and the ip is passed in via the trace_printk macro. This function allows a kernel developer to debug fast path sections that printk is not appropriate for. By scattering in various printk like tracing in the code, a developer can quickly see where problems are occurring. This is intended as a debugging tool for the developer only. Please refrain from leaving trace_printks scattered around in your code. (Extra memory is used for special buffers that are allocated when trace_printk is used) A little optization trick is done here. If there's only one argument, there's no need to scan the string for printf formats. The trace_puts will suffice. But how can we take advantage of using trace_puts when trace_printk has only one argument? By stringifying the args and checking the size we can tell whether or not there are args. __stringify((__VA_ARGS__)) will turn into "()" with a size of 3 when there are no args, anything else will be bigger. All we need to do is define a string to this, and then take its size and compare to 3. If it's bigger, use do_trace_printk otherwise, optimize it to trace_puts. Then just let gcc optimize the rest. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 TRACE_PRINTK(9)
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