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x86: avoid duplicate running of pud_offset and pmd_offset in one_md_table_init()

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Impact: simplify implementation, cleanup

If !(pgd_val(*pgd) & _PAGE_PRESENT) in PAE mode, we need not get value of
pmd_table again.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Zhaolei 2008-10-31 17:43:04 +08:00 committed by Ingo Molnar
parent 7a5276889c
commit a376f30a95
1 changed files with 2 additions and 0 deletions
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2
arch/x86/mm/init_32.c
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@ -102,6 +102,8 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
return pmd_table;
}
#endif
pud = pud_offset(pgd, 0);