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 e75fa7e9b82dfff986c2490343c67bb8e60632ae..c2ec8356667992b9fb36d697a7b10bd735ce796e 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1148,10 +1148,9 @@ 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;
@@ -1159,7 +1158,7 @@ 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);
        }