s390/pgtable: skip pgste updates on full flush

On process exit there is no more need for the pgste information.
Skip the expensive storage key operations which should speed up
termination of KVM processes.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2a6364b6f55617ab47d12b2d43778b708064dbbc..236b24ad1f2b130b1456ec14faa1201170e87888 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1146,10 +1146,9 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
        pgste_t pgste;
        pte_t pte;
 
-       if (mm_has_pgste(mm)) {
+       if (!full && mm_has_pgste(mm)) {
                pgste = pgste_get_lock(ptep);
-               if (!full)
-                       pgste = pgste_ipte_notify(mm, address, ptep, pgste);
+               pgste = pgste_ipte_notify(mm, address, ptep, pgste);
        }
 
        pte = *ptep;
@@ -1157,7 +1156,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
                __ptep_ipte(address, ptep);
        pte_val(*ptep) = _PAGE_INVALID;
 
-       if (mm_has_pgste(mm)) {
+       if (!full && mm_has_pgste(mm)) {
                pgste = pgste_update_all(&pte, pgste);
                pgste_set_unlock(ptep, pgste);
        }