From: Valdis.Kletnieks@vt.edu (Valdis.Kletnieks at vt.edu)
To: kernelnewbies@lists.kernelnewbies.org
Subject: zap_low_mappings
Date: Wed, 06 Mar 2013 22:19:28 -0500 [thread overview]
Message-ID: <8572.1362626368@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Thu, 07 Mar 2013 10:33:18 +0800." <20130307023318.GA2940@debian.localdomain>
On Thu, 07 Mar 2013 10:33:18 +0800, ishare said:
>
> kernel halts because the page mapping has been modified by zap_low_mappings
>
>
> why we should do zap_low_mappings in init procedure ? this will disorder the page mapping.
You might want to get yourself an up to date kernel, as the code you're
asking about was removed almost 2 1/.2 years ago.
zap_low_mappings was removed in October 2010 by this commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/x86/mm/init_32.c?id=b40827fa7268fda8a62490728a61c2856f33830b
x86-32, mm: Add an initial page table for core bootstrapping
This patch adds an initial page table with low mappings used exclusively for
booting APs/resuming after ACPI suspend/machine restart. After this, there's no
need to add low mappings to swapper_pg_dir and zap them later or create own
swsusp PGD page solely for ACPI sleep needs - we have initial_page_table for
that.
Signed-off-by: Borislav Petkov <bp@alien8.de>
LKML-Reference:<20101020070526.GA9588@liondog.tnic>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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next prev parent reply other threads:[~2013-03-07 3:19 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 ` Valdis.Kletnieks at vt.edu [this message]
2013-03-07 3:43 ` zap_low_mappings ishare
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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