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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2018-10-15 11:25:57 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-11-02 10:31:53 +0300
commit1071fc5779d9846fec56a4ff6089ab08cac1ab72 (patch)
tree9e20a5fd7a7a2c993e89ef28497dd52f9974daae /include/asm-generic
parenta8874e7e8a8896f2b6c641f4b8e2473eafd35204 (diff)
downloadlinux-1071fc5779d9846fec56a4ff6089ab08cac1ab72.tar.xz
mm: introduce mm_[p4d|pud|pmd]_folded
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>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/pgtable.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 88ebc6102c7c..15fd0277ffa6 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -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 */