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[PW_SID:991531] riscv: Use an atomic xchg in pudp_huge_get_and_clear() #777

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[PW_SID:991531] riscv: Use an atomic xchg in pudp_huge_get_and_clear() #777

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11 changes: 11 additions & 0 deletions arch/riscv/include/asm/pgtable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -942,6 +942,17 @@ static inline int pudp_test_and_clear_young(struct vm_area_struct *vma,
return ptep_test_and_clear_young(vma, address, (pte_t *)pudp);
}

#define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
unsigned long address, pud_t *pudp)
{
pud_t pud = __pud(atomic_long_xchg((atomic_long_t *)pudp, 0));

page_table_check_pud_clear(mm, pud);

return pud;
}

static inline int pud_young(pud_t pud)
{
return pte_young(pud_pte(pud));
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