sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390

This patch adds an implementation of pmd_pgprot() for s390,
in preparation to future THP changes.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index dd647c919a66c766a75a8114588f1cd51afdafd7..098fc5a6bd5248f28dc77e6233706902f4475bbb 100644 (file)
--- 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;