From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Tue, 23 Sep 2014 12:01:34 +0000 (+0200)
Subject: s390/mm: add NUMA balancing primitives
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b54565b86824ecc9f0ad5d0ee69696f38edc50fd;p=linux-beck.git

s390/mm: add NUMA balancing primitives

Define pte_protnone and pmd_protnone for NUMA memory migration.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index f66d82798a6a..bdb2f51124ed 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -576,6 +576,19 @@ static inline int pte_same(pte_t a, pte_t b)
 	return pte_val(a) == pte_val(b);
 }
 
+#ifdef CONFIG_NUMA_BALANCING
+static inline int pte_protnone(pte_t pte)
+{
+	return pte_present(pte) && !(pte_val(pte) & _PAGE_READ);
+}
+
+static inline int pmd_protnone(pmd_t pmd)
+{
+	/* pmd_large(pmd) implies pmd_present(pmd) */
+	return pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_READ);
+}
+#endif
+
 static inline pgste_t pgste_get_lock(pte_t *ptep)
 {
 	unsigned long new = 0;