From 8d6037a7b4f21708451d4aec14828f9ebe77b37a Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Mon, 9 May 2016 11:15:32 +0200 Subject: [PATCH] s390/mm: simplify get_guest_storage_key We can safe a few LOC and make that function easier to understand by rewriting existing code. Reviewed-by: Christian Borntraeger Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/mm/pgtable.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 7612a7c..4c8d572 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -551,20 +551,11 @@ unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr) return -EFAULT; pgste = pgste_get_lock(ptep); - if (pte_val(*ptep) & _PAGE_INVALID) { - key = (pgste_val(pgste) & PGSTE_ACC_BITS) >> 56; - key |= (pgste_val(pgste) & PGSTE_FP_BIT) >> 56; - key |= (pgste_val(pgste) & PGSTE_GR_BIT) >> 48; - key |= (pgste_val(pgste) & PGSTE_GC_BIT) >> 48; - } else { + key = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56; + if (!(pte_val(*ptep) & _PAGE_INVALID)) key = page_get_storage_key(pte_val(*ptep) & PAGE_MASK); - - /* Reflect guest's logical view, not physical */ - if (pgste_val(pgste) & PGSTE_GR_BIT) - key |= _PAGE_REFERENCED; - if (pgste_val(pgste) & PGSTE_GC_BIT) - key |= _PAGE_CHANGED; - } + /* Reflect guest's logical view, not physical */ + key |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48; pgste_set_unlock(ptep, pgste); pte_unmap_unlock(ptep, ptl); return key; -- 2.7.4