mm: introduce mm_[p4d|pud|pmd]_folded (1071fc57) · Commits · 戴 / test

Add three architecture overrideable functions to test if the p4d, pud, or pmd layer of a page table is folded or not. Acked-by:

include/asm-generic/pgtable.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -1127,4 +1127,20 @@ 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 */