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@xxxxxxxxx> LKML-Reference:<20101020070526.GA9588@xxxxxxxxxxxx> Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
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