issue: insert kernel module failed with CONFIG_HIGHMEM enabled

[Chao Xie]

>
> hello
> i am working at PXA9xx chip. It has two DDR banks, and each bank is 256MB.
> In order to get more kernel virtual address, i have enabled CONFIG_HIGHMEM,
> and make the second bank to be high memory. It means that i have one bank
> starting virtual address from 0xC0000000 as low memory, and the second bank
> is high memory.
> I have compiled a module which will make use of graphics accelarate
> function in PXA9XX. The module works fine when CONFIG_HIGHMEM is not
> enabled. I can successfully insert the module. But when CONFIG_HIGHMEM is
> enabled, i fail to insert this module, and it reports the error likes:
>
> graphics: relocation out of range, section 2 reloc 315 sym '__kmalloc'
> Module len 32542 truncated
>
> I searched the kernel source, and find it is reported by
> arch/arm/kernel/module.c. It seems that the symbols in the relocation
> section can not be relocated because the section only relocate the symbols
> in offset of 24 bits.
> I think this issue is related to CONFIG_HIGHMEM. Can anyone help me about
> the root cause of the issue and how to fix it?
>
> Thanks.
> Chao
>
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