Unverified Commit 50b5bae5 authored by Alexandre Ghiti's avatar Alexandre Ghiti Committed by Palmer Dabbelt
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riscv: Implement pte_accessible() 



Like other architectures, a pte is accessible if it is present or if
there is a pending tlb flush and the pte is protnone (which could be the
case when a pte is downgraded to protnone before a flush tlb is
executed).

Signed-off-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240128115953.25085-1-alexghiti@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 914e618b

arch/riscv/include/asm/pgtable.h

+13 −0
Original line number Diff line number Diff line
@@ -350,6 +350,19 @@ static inline int pte_present(pte_t pte) 
	return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE));

}



#define pte_accessible pte_accessible

static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)

{

	if (pte_val(a) & _PAGE_PRESENT)

		return true;



	if ((pte_val(a) & _PAGE_PROT_NONE) &&

	    atomic_read(&mm->tlb_flush_pending))

		return true;



	return false;

}



static inline int pte_none(pte_t pte)

{

	return (pte_val(pte) == 0);