| Message ID | 20190306155031.4291-4-steven.price@arm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | None | expand |
Hi Steven, On Wed, Mar 06, 2019 at 03:50:15PM +0000, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_large() functions/macros. > > For mips, we only support large pages on 64 bit. > > For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not > defined we can be confident that there are no large pages in existence > and fall back on the generic implementation (added in a later patch) > which returns 0. > > CC: Ralf Baechle <ralf@linux-mips.org> > CC: Paul Burton <paul.burton@mips.com> > CC: James Hogan <jhogan@kernel.org> > CC: linux-mips@vger.kernel.org > Signed-off-by: Steven Price <steven.price@arm.com> Acked-by: Paul Burton <paul.burton@mips.com> Thanks, Paul
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 93a9dce31f25..42162877ac62 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) return pmd_val(pmd) != (unsigned long) invalid_pte_table; } +#ifdef _PAGE_HUGE +#define pmd_large(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#endif + static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) return pud_val(pud) != (unsigned long) invalid_pmd_table; } +#ifdef _PAGE_HUGE +#define pud_large(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + static inline void pud_clear(pud_t *pudp) { pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information is provided by the p?d_large() functions/macros. For mips, we only support large pages on 64 bit. For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no large pages in existence and fall back on the generic implementation (added in a later patch) which returns 0. CC: Ralf Baechle <ralf@linux-mips.org> CC: Paul Burton <paul.burton@mips.com> CC: James Hogan <jhogan@kernel.org> CC: linux-mips@vger.kernel.org Signed-off-by: Steven Price <steven.price@arm.com> --- arch/mips/include/asm/pgtable-64.h | 8 ++++++++ 1 file changed, 8 insertions(+)