On Thu, Nov 12, 2015 at 08:48:54AM +0100, Ingo Molnar wrote:
>
> * Borislav Petkov <b...@alien8.de> wrote:
>
> > --- a/arch/x86/include/asm/pgtable_types.h
> > +++ b/arch/x86/include/asm/pgtable_types.h
> > @@ -279,17 +279,14 @@ static inline pmdval_t native_pmd_val(pmd_t pmd)
> > static inline pudval_t pud_pfn_mask(pud_t pud)
> > {
> > if (native_pud_val(pud) & _PAGE_PSE)
> > - return PUD_PAGE_MASK & PHYSICAL_PAGE_MASK;
> > + return ~((1ULL << PUD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;
> > else
> > return PTE_PFN_MASK;
> > }
>
> > static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
> > {
> > if (native_pmd_val(pmd) & _PAGE_PSE)
> > - return PMD_PAGE_MASK & PHYSICAL_PAGE_MASK;
> > + return ~((1ULL << PMD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;
> > else
> > return PTE_PFN_MASK;
> > }
>
> So instead of uglifying the code, why not fix the real bug: change the
> PMD_PAGE_MASK/PUD_PAGE_MASK definitions to be 64-bit everywhere?
*PAGE_MASK are usually applied to virtual addresses. I don't think it
should anything but 'unsigned long'. This is odd use case really.
--
Kirill A. Shutemov
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