diff mbox series

[2/4] mm: introduce mm_[p4d|pud|pmd]_folded

Message ID 1540990801-4261-3-git-send-email-schwidefsky@de.ibm.com (mailing list archive)
State New, archived
Headers show
Series pgtable bytes mis-accounting v3 | expand

Commit Message

Martin Schwidefsky Oct. 31, 2018, 12:59 p.m. UTC 
Add three architecture overrideable functions to test if the
p4d, pud, or pmd layer of a page table is folded or not.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 include/asm-generic/pgtable.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Comments

Kirill A. Shutemov Oct. 31, 2018, 1:23 p.m. UTC | #1 
On Wed, Oct 31, 2018 at 01:59:59PM +0100, Martin Schwidefsky wrote:
> Add three architecture overrideable functions to test if the
> p4d, pud, or pmd layer of a page table is folded or not.
> 
> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
diff mbox series

Patch

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 5657a20..359fb93 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 */