I found it. 1 << gd->minor_shift, per Andries Brouwer's patch of June 2001.
-Matt
-- Matt Domsch Sr. Software Engineer Dell Linux Solutions www.dell.com/linux #1 US Linux Server provider with 24.5% (IDC Dec 2001) #2 Worldwide Linux Server provider with 18.2% (IDC Dec 2001) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/