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printk: split out core logging code into helper function
The code that actually decides how to log the message (whether to put it directly into the record log, whether to append it to an existing buffered log, or whether to start a new buffered log) is fairly non-obvious code in the middle of the vprintk_emit() function. Splitting that code up into a helper function makes it easier to understand, but perhaps more importantly also allows for the code to just return early out of the helper function once it has made the decision about where the new log content goes. Signed-off-by: Linus Torvalds <[email protected]>
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