Viewing file:  pte-walk.h (1.61 KB) -rw-r--r--
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#ifndef _ASM_POWERPC_PTE_WALK_H
#define _ASM_POWERPC_PTE_WALK_H
#include <linux/sched.h>
/* Don't use this directly */
extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift);
static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift)
{
pte_t *pte;
VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
#if defined(CONFIG_DEBUG_VM) && \
!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
/*
* We should not find huge page if these configs are not enabled.
*/
if (hshift)
WARN_ON(*hshift);
#endif
return pte;
}
static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
{
pgd_t *pgdir = init_mm.pgd;
return __find_linux_pte(pgdir, ea, NULL, hshift);
}
/*
* This is what we should always use. Any other lockless page table lookup needs
* careful audit against THP split.
*/
static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift)
{
pte_t *pte;
VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
VM_WARN(pgdir != current->mm->pgd,
"%s lock less page table lookup called on wrong mm\n", __func__);
pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
#if defined(CONFIG_DEBUG_VM) && \
!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
/*
* We should not find huge page if these configs are not enabled.
*/
if (hshift)
WARN_ON(*hshift);
#endif
return pte;
}
#endif /* _ASM_POWERPC_PTE_WALK_H */
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