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

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[ 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>
This commit is contained in:
Martin Schwidefsky 2018-10-15 10:25:57 +02:00 committed by Greg Kroah-Hartman
parent b66f198bf3
commit 90b8693b9e
1 changed files with 16 additions and 0 deletions
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16
include/asm-generic/pgtable.h
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@ -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 */