Messages in this thread Patch in this message | | | Date | Thu, 25 Oct 2012 14:16:24 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390 |
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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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