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Comments found in the Kernel Source
found in linux kernel (include/linux/jiffies.h)
#else # error You lose. #endif
/* * Do this with "<0" and ">=0" to only test the sign of the result. A * good compiler would generate better code (and a really good compiler * wouldn't care). Gcc is currently neither. */
found in drivers/serial/8250.c
/* * This is a quickie test to see how big the FIFO is. * It doesn't work at all the time, more's the pity. */
/* * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. * When this function is called we know it is at least a StarTech * 16650 V2, but it might be one of several StarTech UARTs, or one of * its clones. (We treat the broken original StarTech 16650 V1 as a * 16550, and why not? Startech doesn't seem to even acknowledge its * existence.) * * What evil have men's minds wrought... */