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x86: debug pmd_bad()

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-03-03 09:53:17 +01:00
parent 40869cd038
commit 9fc34113f6
2 changed files with 12 additions and 1 deletions
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7
arch/x86/mm/pgtable_32.c
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@ -381,3 +381,10 @@ void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
}
#endif
int pmd_bad(pmd_t pmd)
{
WARN_ON_ONCE(pmd_bad_v1(pmd) != pmd_bad_v2(pmd));
return pmd_bad_v1(pmd);
}

6
include/asm-x86/pgtable_32.h
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@ -90,7 +90,11 @@ extern unsigned long pg0[];
/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */
#define pmd_none(x) (!(unsigned long)pmd_val(x))
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
#define pmd_bad(x) ((pmd_val(x) \
extern int pmd_bad(pmd_t pmd);
#define pmd_bad_v1(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pmd_bad_v2(x) ((pmd_val(x) \
& ~(PAGE_MASK | _PAGE_USER | _PAGE_PSE | _PAGE_NX)) \
!= _KERNPG_TABLE)