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Subject2.5.6-pre2: ide.c doesn't build if no IDE chipsets chosen
gcc -D__KERNEL__ -I/usr/src/linux-2.5.6-pre2/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686   -DKBUILD_BASENAME=ide  -DEXPORT_SYMTAB -c ide.c
ide.c:161: parse error before "ide_pio_timings"
ide.c:161: warning: type defaults to `int' in declaration of `ide_pio_timings'
ide.c:162: warning: braces around scalar initializer
ide.c:162: warning: (near initialization for `ide_pio_timings[0]')
ide.c:162: warning: excess elements in scalar initializer
ide.c:162: warning: (near initialization for `ide_pio_timings[0]')
ide.c:162: warning: excess elements in scalar initializer
ide.c:162: warning: (near initialization for `ide_pio_timings[0]')
ide.c:163: warning: braces around scalar initializer
ide.c:163: warning: (near initialization for `ide_pio_timings[1]')
ide.c:163: warning: excess elements in scalar initializer
ide.c:163: warning: (near initialization for `ide_pio_timings[1]')

etc. etc.

Turns out ide_pio_timings_t is only defined within a
#ifdef CONFIG_BLK_DEV_IDE_MODES block. That one seems to only kick
in if I select at least one if the IDE chipsets. Mine is a PIIX4,
but the configuration help seems to suggest I only set it if I
suspect BIOS problems so I can hand-tune the chipset via hdparm;
"if unsure, say N". I've been doing so for more time than I can
remember without any issue and a spiffy hdparm output - this is
the current 2.4.19-pre1 from which I built 2.5.6-pre2:

[root@dolphin root]# hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.80 seconds =160.00 MB/sec
Timing buffered disk reads: 64 MB in 3.99 seconds = 16.04 MB/sec


I now built the kernel after selecting PIIXn support, but is this
a bug in the dependencies or in the configuration help text for
the PIIXn chipsets ?


Thanks,

--alessandro

"If your heart is a flame burning brightly
you'll have light and you'll never be cold
And soon you will know that you just grow / You're not growing old"
(Husker Du, "Flexible Flyer")

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