[ Upstream commit 1071fc5779d9846fec56a4ff6089ab08cac1ab72 ]
Add three architecture overrideable functions to test if the p4d, pud, or pmd layer of a page table is folded or not.
Acked-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Signed-off-by: Martin Schwidefsky schwidefsky@de.ibm.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- include/asm-generic/pgtable.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index f00421dfacbd0..0c21014a38f23 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -1081,4 +1081,20 @@ static inline bool arch_has_pfn_modify_check(void) #endif #endif
+/* + * On some architectures it depends on the mm if the p4d/pud or pmd + * layer of the page table hierarchy is folded or not. + */ +#ifndef mm_p4d_folded +#define mm_p4d_folded(mm) __is_defined(__PAGETABLE_P4D_FOLDED) +#endif + +#ifndef mm_pud_folded +#define mm_pud_folded(mm) __is_defined(__PAGETABLE_PUD_FOLDED) +#endif + +#ifndef mm_pmd_folded +#define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */