BPRINTF(9) Basic C Library Functions BPRINTF(9)NAME
bprintf - Parse a format string and place args' binary value in a buffer
SYNOPSIS
int bprintf(u32 * bin_buf, size_t size, const char * fmt, ...);
ARGUMENTS
bin_buf
The buffer to place args' binary value
size
The size of the buffer(by words(32bits), not characters)
fmt
The format string to use @...: Arguments for the format string
...
variable arguments
DESCRIPTION
The function returns the number of words(u32) written into bin_buf.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BPRINTF(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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