Messages in this thread | | | Date | Wed, 6 Apr 2016 11:56:24 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH 1/1] powerpc/mm: Add memory barrier in __hugepte_alloc() |
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On Tue 05-04-16 12:05:47, Sukadev Bhattiprolu wrote: [...] > diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c > index d991b9e..081f679 100644 > --- a/arch/powerpc/mm/hugetlbpage.c > +++ b/arch/powerpc/mm/hugetlbpage.c > @@ -81,6 +81,13 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, > if (! new) > return -ENOMEM; > > + /* > + * Make sure other cpus find the hugepd set only after a > + * properly initialized page table is visible to them. > + * For more details look for comment in __pte_alloc(). > + */ > + smp_wmb(); > +
what is the pairing memory barrier?
> spin_lock(&mm->page_table_lock); > #ifdef CONFIG_PPC_FSL_BOOK3E > /* > -- > 1.8.3.1
-- Michal Hocko SUSE Labs
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