zap_low_mappings

[Valdis.Kletnieks at vt.edu]

On Thu, 07 Mar 2013 11:43:43 +0800, ishare said:

> 		set_pgd(swapper_pg_dir+i, __pgd(0));

> If I have not define CONFIG_X86_PAE ,then the low mem will be invalided all .

And what makes you think that call invalidates *all* the page
mappings?
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