[ACPI-sppt] howto patch osl.c

hi,
i want to upgrade to a 2.4.22 kernel. (the ck - patched kernel from the gentoo 
portage tree)
I applied the latest acpi patch (from acpi.sf.net) . had some rejects but 
fixed that manually. 
Then I need to patch the drivers/acpi/osl.c so that I can use a custom DSDT 
table.
the page at http://www.cpqlinux.com/acpi-howto.html does provide a patch, 
which i apllied manually. But there is something wrong at line 235.

make gives me the following output :
##################
make[3]: Entering directory `/usr/src/linux-2.4.22-ck2/drivers/acpi'
gcc -D__KERNEL__ -I/usr/src/linux-2.4.22-ck2/include -Wall -Wstrict-prototypes 
-Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer 
-pipe -mpreferred-stack-boundary=2 -march=i686  -Os  -nostdinc -iwithprefix 
include -DKBUILD_BASENAME=osl  -c -o osl.o osl.c
osl.c: In function `acpi_os_table_override':
osl.c:235: `acpi_table_header' undeclared (first use in this function)
osl.c:235: (Each undeclared identifier is reported only once
osl.c:235: for each function it appears in.)
osl.c:235: parse error before ')' token
osl.c:235: warning: statement with no effect
make[3]: *** [osl.o] Error 1
###################

my patched osl.c looks like :
###################
acpi_status
acpi_os_table_override (struct acpi_table_header *existing_table,
                        struct acpi_table_header **new_table)
{
        if (!existing_table || !new_table)
                return AE_BAD_PARAMETER;

        if (strncmp(existing_table->signature, "DSDT", 4) == 0)
                *new_table = (acpi_table_header*)AmlCode;
        else
                *new_table = NULL;
        return AE_OK;
}
###################

What is wrong with that piece of code? I think I remember that the page at 
http://www.cpqlinux.com/acpi-howto.html once said that you have to change the 
"struct" with somthing else. But this information is longer available at this 
page. 
I am not a c programmer so I hope someone can help me out here. 

Thanks alot !!!

Thomas



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