x86: debug pmd_bad()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -381,3 +381,10 @@ void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
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}
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}
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#endif
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#endif
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int pmd_bad(pmd_t pmd)
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{
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WARN_ON_ONCE(pmd_bad_v1(pmd) != pmd_bad_v2(pmd));
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return pmd_bad_v1(pmd);
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}
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@ -90,7 +90,11 @@ extern unsigned long pg0[];
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/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */
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/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */
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#define pmd_none(x) (!(unsigned long)pmd_val(x))
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#define pmd_none(x) (!(unsigned long)pmd_val(x))
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_bad(x) ((pmd_val(x) \
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extern int pmd_bad(pmd_t pmd);
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#define pmd_bad_v1(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pmd_bad_v2(x) ((pmd_val(x) \
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& ~(PAGE_MASK | _PAGE_USER | _PAGE_PSE | _PAGE_NX)) \
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& ~(PAGE_MASK | _PAGE_USER | _PAGE_PSE | _PAGE_NX)) \
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!= _KERNPG_TABLE)
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!= _KERNPG_TABLE)
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