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    Subject[PATCH 58 of 66] don't allow transparent hugepage support without PSE
    Date
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    From: Andrea Arcangeli <aarcange@redhat.com>

    Archs implementing Transparent Hugepage Support must implement a
    function called has_transparent_hugepage to be sure the virtual or
    physical CPU supports Transparent Hugepages.

    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    ---

    diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
    --- a/arch/x86/include/asm/pgtable.h
    +++ b/arch/x86/include/asm/pgtable.h
    @@ -160,6 +160,11 @@ static inline int pmd_trans_huge(pmd_t p
    {
    return pmd_val(pmd) & _PAGE_PSE;
    }
    +
    +static inline int has_transparent_hugepage(void)
    +{
    + return cpu_has_pse;
    +}
    #endif /* CONFIG_TRANSPARENT_HUGEPAGE */

    static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
    diff --git a/mm/huge_memory.c b/mm/huge_memory.c
    --- a/mm/huge_memory.c
    +++ b/mm/huge_memory.c
    @@ -487,7 +487,15 @@ static int __init hugepage_init(void)
    int err;
    #ifdef CONFIG_SYSFS
    static struct kobject *hugepage_kobj;
    +#endif

    + err = -EINVAL;
    + if (!has_transparent_hugepage()) {
    + transparent_hugepage_flags = 0;
    + goto out;
    + }
    +
    +#ifdef CONFIG_SYSFS
    err = -ENOMEM;
    hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
    if (unlikely(!hugepage_kobj)) {

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