Here are two new uses of floating point that popped up in the 2.4.5-ac4 kernel. While the expressions that use FP are trivial, at least my version of gcc does not calculate them at compile time. As a bonus, two old, but still existing FP uses are also included. Dawson MC linux bug database: http://hands.stanford.edu/linux ############################################################ # New errors. # --------------------------------------------------------- [BUG] DMFE_TX_TIMEOUT is HZ * 1.5 which seems easy to fix. /u2/engler/mc/oses/linux/2.4.5-ac4/drivers/net/dmfe.c:1112:dmfe_timer: ERROR:FLOAT: cannot use fp in kernel if ( db->tx_packet_cnt && ((jiffies - dev->trans_start) > DMFE_TX_KICK) ) { outl(0x1, dev->base_addr + DCR1); /* Tx polling again */ /* TX Timeout */ Error ---> if ( (jiffies - dev->trans_start) > DMFE_TX_TIMEOUT ) { --------------------------------------------------------- [BUG] DMFE_TX_KICK is (HZ * 0.5) which gcc does as floating point. Fix is trivial: just divide by 2 instead. /u2/engler/mc/oses/linux/2.4.5-ac4/drivers/net/dmfe.c:1108:dmfe_timer: ERROR:FLOAT: cannot use fp in kernel } db->interval_rx_cnt = 0; /* TX polling kick monitor */ if ( db->tx_packet_cnt && Error ---> ((jiffies - dev->trans_start) > DMFE_TX_KICK) ) { ############################################################ # Existing, unfixed errors # --------------------------------------------------------- [BUG] /u2/engler/mc/oses/linux/2.4.5-ac4/drivers/video/sgivwfb.c:731:sgivwfb_set_var: ERROR:FLOAT: cannot use fp in kernel var->green.msb_right = 0; var->blue.msb_right = 0; var->transp.msb_right = 0; /* set video timing information */ Error ---> var->pixclock = (__u32)(1.0e+9/(float)timing->cfreq); --------------------------------------------------------- [BUG] /u2/engler/mc/oses/linux/2.4.5-ac4/drivers/video/sgivwfb.c:664:sgivwfb_set_var: ERROR:FLOAT: cannot use fp in kernel return -EINVAL; /* Resolution to high */ /* XXX FIXME - should try to pick best refresh rate */ /* for now, pick closest dot-clock within 3MHz*/ #error "Floating point not allowed in kernel" Error ---> req_dot = (int)((1.0e3/1.0e6) / (1.0e-12 * (float)var->pixclock)); ############################################################ # Old fixed # [FIXED] sis_main.c:crtc_to_var:FLOAT: cannot use fp in kerne /u2/engler/mc/oses/linux/2.4.4/drivers/video/sis/sis_main.c:588:crtc_to_var: ERROR:FLOAT: cannot use fp in kernel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
