[PATCH] Avoid duplicate running of pud_offset and pmd_offset in one_md_table_init() - Kernel

This is a discussion on [PATCH] Avoid duplicate running of pud_offset and pmd_offset in one_md_table_init() - Kernel ; If !(pgd_val(*pgd) & _PAGE_PRESENT) in PAE mode, we need not get value of pmd_table again. Signed-off-by: Zhao Lei --- arch/x86/mm/init_32.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 8396868..7f8a2da 100644 --- a/arch/x86/mm/init_32.c +++ ...

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Thread: [PATCH] Avoid duplicate running of pud_offset and pmd_offset in one_md_table_init()

  1. [PATCH] Avoid duplicate running of pud_offset and pmd_offset in one_md_table_init()

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

    Signed-off-by: Zhao Lei
    ---
    arch/x86/mm/init_32.c | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
    index 8396868..7f8a2da 100644
    --- a/arch/x86/mm/init_32.c
    +++ b/arch/x86/mm/init_32.c
    @@ -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);
    --
    1.5.5.3

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  2. Re: [PATCH] Avoid duplicate running of pud_offset and pmd_offset in one_md_table_init()


    * Zhaolei wrote:

    > If !(pgd_val(*pgd) & _PAGE_PRESENT) in PAE mode, we need not get value of
    > pmd_table again.
    >
    > Signed-off-by: Zhao Lei
    > ---
    > arch/x86/mm/init_32.c | 2 ++
    > 1 files changed, 2 insertions(+), 0 deletions(-)


    applied to tip/x86/cleanups, thanks!

    Ingo
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