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    SubjectRe: [PATCH] x86-32: use brk segment for allocating initial kernel pagetable
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    On Fri, Feb 27, 2009 at 5:51 PM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    > From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    >
    > Rather than having special purpose init_pg_table_start/end variables
    > to delimit the kernel pagetable built by head_32.S, just use the brk
    > mechanism to extend the bss for the new pagetable.
    >
    > This patch removes init_pg_table_start/end and pg0, defines __brk_base
    > (which is page-aligned and immediately follows _end), initializes
    > the brk region to start there, and uses it for the 32-bit pagetable.
    ...

    > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
    > index c246dc4..ed02176 100644
    > --- a/arch/x86/kernel/setup.c
    > +++ b/arch/x86/kernel/setup.c
    > @@ -113,8 +113,10 @@
    >  #endif
    >
    >  unsigned int boot_cpu_id __read_mostly;
    > -__initdata unsigned long _brk_start = (unsigned long)&_end;
    > -__initdata unsigned long _brk_end = (unsigned long)&_end;
    > +
    > +extern char __brk_base[];
    > +__initdata unsigned long _brk_start = (unsigned long)__brk_base;
    > +__initdata unsigned long _brk_end = (unsigned long)&__brk_base;

    ?

    YH
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