From: june.tune.sea@gmail.com (ishare)
To: kernelnewbies@lists.kernelnewbies.org
Subject: zap_low_mappings
Date: Thu, 7 Mar 2013 11:43:43 +0800 [thread overview]
Message-ID: <20130307034342.GA17978@debian.localdomain> (raw)
In-Reply-To: <8572.1362626368@turing-police.cc.vt.edu>
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 ?
next prev parent reply other threads:[~2013-03-07 3:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-07 2:33 zap_low_mappings ishare
2013-03-07 3:19 ` zap_low_mappings Valdis.Kletnieks at vt.edu
2013-03-07 3:43 ` ishare [this message]
2013-03-07 4:00 ` zap_low_mappings Valdis.Kletnieks at vt.edu
2013-03-07 4:48 ` zap_low_mappings ishare
2013-03-07 5:34 ` zap_low_mappings Valdis.Kletnieks at vt.edu
2013-03-07 11:50 ` zap_low_mappings ishare
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