From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon, 15 Oct 2018 08:25:57 +0000 (+0200)
Subject: mm: introduce mm_[p4d|pud|pmd]_folded
X-Git-Tag: v4.19.13~14
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=89d6fff0747f50dfef8460527f74d296cc6cb7dc;p=platform%2Fkernel%2Flinux-rpi3.git

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: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 88ebc61..15fd027 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 */