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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. */