huang ying wrote:
If CONFIG_X86_PAE is defined, the set_pte, clear_pte etc will operate
3-level page tables, while on i386, the early page table is always
2-level, so set_pte, clear_pte etc functions can not be used here. The
boot_ioremap use a trick to deal with this problem. The CONFIG_X86_PAE
is undefined in arch/x86/mm/boot_ioremap_32.c unconditionally, so the
2-level page table handling function is always used.
Is the method used by boot_ioremap better for Xen?
Eric Biederman had a patchset that makes a PAE kernel use PAE page
tables from the start. That is really The Right Thing[TM].
-hpa
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