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    Subject[PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390
    From: Gerald Schaefer <gerald.schaefer@de.ibm.com>

    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>
    ---
    arch/s390/include/asm/pgtable.h | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    Index: tip/arch/s390/include/asm/pgtable.h
    ===================================================================
    --- tip.orig/arch/s390/include/asm/pgtable.h
    +++ tip/arch/s390/include/asm/pgtable.h
    @@ -1240,6 +1240,19 @@ static inline void set_pmd_at(struct mm_
    *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;



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