2.4.13-pre1: sonypi.c compile error

[Eyal Lebedinsky <eyal@eyal.emu.id.au>]

gcc -D__KERNEL__ -I/data2/usr/local/src/linux-2.4-pre/include -Wall
-Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer
-fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2
-march=i686 -malign-functions=4  -DMODULE -DMODVERSIONS -include
/data2/usr/local/src/linux-2.4-pre/include/linux/modversions.h  
-DEXPORT_SYMTAB -c sonypi.c
sonypi.c: In function `sonypi_init_module':
sonypi.c:702: `is_sony_vaio_laptop_R7462d5e4' undeclared (first use in
this function)
sonypi.c:702: (Each undeclared identifier is reported only once
sonypi.c:702: for each function it appears in.)
make[2]: *** [sonypi.o] Error 1
make[2]: Leaving directory
`/data2/usr/local/src/linux-2.4-pre/drivers/char'

Now this is what we have here, I can not figure the intentions of the
author:

static int __init sonypi_init_module(void) {
        if (is_sony_vaio_laptop)
                return pci_module_init(&sonypi_driver);
        else
                return -ENODEV;
}

--
Eyal Lebedinsky (eyal@eyal.emu.id.au) <http://samba.anu.edu.au/eyal/>