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SubjectRe: [PATCH] x86: put initial_pg_tables into .bss -v4
H. Peter Anvin wrote:
> Yinghai Lu wrote:
>> Impact: cleanup
>>
>> Don't use ram after _end blindly for pagetables. aka init pages is before _end
>> put those pg table into .bss
>>
>> v2: keep initial page table up to 512M only.
>> v4: put initial page tables just before _end
>>
>> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>>
>
> I still feel that this is a movement in *EXACTLY* the wrong direction,
> as it is deliberately intended to prevent a general allocator for
> anything that needs to be dynamic very early on. I still think that
> makes a lot more sense.

it just estimates initial_pg_tables size, and make _end a little bigger (1M), so boot loader could have idea of correct size of vmlinux aka the uncompressed size of in kernel.

I assume brk patches could estimate the extra size that it needs too.

YH




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