From 8937ba48dcf62b5cdf7abb93652914af16756f50 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Mon, 18 Nov 2013 14:58:12 +0530 Subject: [PATCH] powerpc/mm: Only check for _PAGE_PRESENT in set_pte/pmd functions We want to make sure we don't use these function when updating a pte or pmd entry that have a valid hpte entry, because these functions don't invalidate them. So limit the check to _PAGE_PRESENT bit. Numafault core changes use these functions for updating _PAGE_NUMA bits. That should be ok because when _PAGE_NUMA is set we can be sure that hpte entries are not present. Signed-off-by: Aneesh Kumar K.V Acked-by: Paul Mackerras Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/mm/pgtable.c | 2 +- arch/powerpc/mm/pgtable_64.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index 841e0d00863c..ad90429bbd8b 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -174,7 +174,7 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { #ifdef CONFIG_DEBUG_VM - WARN_ON(pte_present(*ptep)); + WARN_ON(pte_val(*ptep) & _PAGE_PRESENT); #endif /* Note: mm->context.id might not yet have been assigned as * this context might not have been activated yet when this diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 9d95786aa80f..02e8681fb865 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -687,7 +687,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { #ifdef CONFIG_DEBUG_VM - WARN_ON(!pmd_none(*pmdp)); + WARN_ON(pmd_val(*pmdp) & _PAGE_PRESENT); assert_spin_locked(&mm->page_table_lock); WARN_ON(!pmd_trans_huge(pmd)); #endif -- 2.30.2