[CentOS] Kernel build on i386 and nohighmem forbidden?

Jim Perrin wrote:
>> Thanks for the instructions, although I don't know why that's the 
>> information
>> you are posting. The procedure I'm using works fine. If I turn on 
>> support for
>> HIGHMEM the build works. If HIGHMEM is off, I get the aforementioned 
>> error. Do
>> you have information for me on that issue?
> 
> That's an upstream issue.

If I wanted to report a bug, would I have to report it upstream?