Reducing kernel ide driver probing time.

[hcyun at etri.re.kr]

Hello 

I found that ide driver take too much time for probing unnecessary drives.
(drivers/ide-probe.c) 
it probe from hda to hdl as you can see below and it takes about 3 ~ 4
seconds. 
However common main board have only 2 ide controller so probing over hde is
unnecessary. 
My solution is redefine MAX_HWIF as 2 (originally 6) so I can reduce
probing time down to 1 second. 
Is there any other way which can control this such as using kernel
parameter?

VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1 
    ide0: BM-DMA at 0x1ce0-0x1ce7, BIOS settings: hda:pio, hdb:pio 
    ide1: BM-DMA at 0x1ce8-0x1cef, BIOS settings: hdc:pio, hdd:pio 
probing for hda: present=1, media=32, probetype=ATA 
hda: MAXAN MFD-44-32, ATA DISK drive
probing for hdb: present=0, media=32, probetype=ATA 
probing for hdb: present=0, media=32, probetype=ATAPI 
probing for hdc: present=0, media=32, probetype=ATA 
probing for hdc: present=0, media=32, probetype=ATAPI 
probing for hdd: present=0, media=32, probetype=ATA 
probing for hdd: present=0, media=32, probetype=ATAPI 
probing for hde: present=0, media=32, probetype=ATA 
probing for hde: present=0, media=32, probetype=ATAPI 
probing for hdf: present=0, media=32, probetype=ATA 
probing for hdf: present=0, media=32, probetype=ATAPI 
probing for hdg: present=0, media=32, probetype=ATA 
probing for hdg: present=0, media=32, probetype=ATAPI 
probing for hdh: present=0, media=32, probetype=ATA 
probing for hdh: present=0, media=32, probetype=ATAPI 
probing for hdi: present=0, media=32, probetype=ATA 
probing for hdi: present=0, media=32, probetype=ATAPI 
probing for hdj: present=0, media=32, probetype=ATA 
probing for hdj: present=0, media=32, probetype=ATAPI 
probing for hdk: present=0, media=32, probetype=ATA 
probing for hdk: present=0, media=32, probetype=ATAPI 
probing for hdl: present=0, media=32, probetype=ATA 
probing for hdl: present=0, media=32, probetype=ATAPI 
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 
hda: attached ide-disk driver. 

Regard,
Heechul. 
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