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    SubjectRe: [PATCH v6 19/27] x86, boot: update comments about entries for 64bit image
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    On Thu, Dec 13, 2012 at 4:38 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    > On 12/13/2012 04:13 PM, Yinghai Lu wrote:
    >
    > It is definitely the minmum we can rely on, and so is the minimum we should
    > rely on. In fact, we don't even need .bss/.brk to be mapped, but we
    > probably should require that as a matter of protocol.

    in my version of arch/x86/kernel/head_64.S is using BRK to do
    ident/kernel high mapping
    for kernel that is above 4G.
    so .brk is needed.


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