forked from Minki/linux
d6eacedd1f
Even when we have HugeTLB and THP disabled, kernel linear map can still be mapped with hugepages. This is only an issue with radix translation because hash MMU doesn't map kernel linear range in linux page table and other kernel map areas are not mapped using hugepage. Add config independent helpers and put WARN_ON() when we don't expect things to be mapped via hugepages. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#ifndef _ASM_POWERPC_PTE_WALK_H
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#define _ASM_POWERPC_PTE_WALK_H
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#include <linux/sched.h>
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/* Don't use this directly */
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extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift);
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static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift)
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{
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pte_t *pte;
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VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
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pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
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#if defined(CONFIG_DEBUG_VM) && \
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!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
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/*
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* We should not find huge page if these configs are not enabled.
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*/
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if (hshift)
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WARN_ON(*hshift);
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#endif
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return pte;
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}
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static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
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{
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pgd_t *pgdir = init_mm.pgd;
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return __find_linux_pte(pgdir, ea, NULL, hshift);
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}
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/*
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* This is what we should always use. Any other lockless page table lookup needs
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* careful audit against THP split.
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*/
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static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift)
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{
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pte_t *pte;
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VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
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VM_WARN(pgdir != current->mm->pgd,
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"%s lock less page table lookup called on wrong mm\n", __func__);
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pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
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#if defined(CONFIG_DEBUG_VM) && \
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!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
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/*
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* We should not find huge page if these configs are not enabled.
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*/
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if (hshift)
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WARN_ON(*hshift);
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#endif
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return pte;
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}
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#endif /* _ASM_POWERPC_PTE_WALK_H */
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