From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
This patch adds an implementation of pmd_pgprot() for s390,
in preparation to future THP changes.
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/s390/include/asm/pgtable.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index dd647c9..098fc5a 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1240,6 +1240,19 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
*pmdp = entry;
}
+static inline pgprot_t pmd_pgprot(pmd_t pmd)
+{
+ pgprot_t prot = PAGE_RW;
+
+ if (pmd_val(pmd) & _SEGMENT_ENTRY_RO) {
+ if (pmd_val(pmd) & _SEGMENT_ENTRY_INV)
+ prot = PAGE_NONE;
+ else
+ prot = PAGE_RO;
+ }
+ return prot;
+}
+
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
unsigned long pgprot_pmd = 0;
--
1.7.11.7
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