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Commit 89d6fff0 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Greg Kroah-Hartman
Browse files

mm: introduce mm_[p4d|pud|pmd]_folded 



[ 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: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent ba38c3e7

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 */