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 b09c00b5cfa2e5455b6e11d3bed0dbc535b3d083..b59b44badae94d209a51c0d062d30656f4a39fcd 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1144,10 +1144,9 @@ 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;
@@ -1155,7 +1154,7 @@ 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);
        }