zap_low_mappings

[ishare]

On Wed, Mar 06, 2013 at 11:00:36PM -0500, Valdis.Kletnieks at vt.edu wrote:
> 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?

  because all the  pde (0-768) are set to 0x0 ,so no phsical pages are mapping to these pde . 
  isn't it?