sorry for my outof date kernel .
In the zap_low_mappingd function.there is a selection for kernel,as below:
#ifdef CONFIG_X86_PAE
set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page)));
#else
set_pgd(swapper_pg_dir+i, __pgd(0));
#endif
If I have not define CONFIG_X86_PAE ,then the low mem will be invalided all .
so any addressing
operation will cause a page_fault because that page is not present.
Am I right ?
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