| From | Arnd Bergmann <> | Subject | Re: [PATCH v2 06/31] arm64: MMU fault handling and page table management | Date | Wed, 15 Aug 2012 13:47:00 +0000 |
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On Tuesday 14 August 2012, Catalin Marinas wrote: > + > +pgd_t *pgd_alloc(struct mm_struct *mm) > +{ > + pgd_t *new_pgd; > + > + new_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, PGD_ORDER); > + if (!new_pgd) > + return NULL; > + > + memset(new_pgd, 0, PAGE_SIZE << PGD_ORDER); > + > + return new_pgd; > +} > + > +void pgd_free(struct mm_struct *mm, pgd_t *pgd) > +{ > + free_pages((unsigned long)pgd, PGD_ORDER); > +}
According to the documentation, you should only need 8kb for the pgd on a 64kb page system. Is it required that you use up a full page here?
Arnd
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