Re: [PATCH] IA32 move PG0 page table within kernel data segment

[Andi Kleen]

"bibo,mao" <bibo.mao@xxxxxxxxx> writes:

> Hi,
>   On i386 kernel image can compile and run at any physical address,kernel
> will dynamically establish initial page table at PG0. Currently PG0 address
> is adjacent to _end, that is to say PG0 page table is out of kernel data segment.
>  Some bootloader put initrd image next kernel data segment so that initial
> page table will overwrite initrd imagte. This patch modify this and put PG0
> table at BSS segment and free this space later.
>   This patch limited kernel image size within 64M, it is possible to modify
> ld script to remove this limit, but I am not familiar with ld script.
> 
>  Any comments is welcome.

Looks like a fragile hack. x86-64 has a imho cleaner generic solution
in e820_find_area(). I would suggest to port that over.

-Andi
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