powerpc/mm/hash: Do a local flush if possible when no batch is active

Currently in hpte_need_flush() if there is no batch pending we always do a
global TLB flush, which is inefficient if the mm has never run on another
thread.

Instead do the same check that __flush_tlb_pending() does and check if a local
flush is sufficient when batch->active is false. Instead of open-coding it we
use mm_is_thread_local().

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
[mpe: Don't use a local, just inline mm_is_thread_local()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/tlb_hash64.c b/arch/powerpc/mm/tlb_hash64.c
index 4517aa43a8b1cc00452c946cea9777c04f13bd25..b5b0fb97b9c03c4e8bfa5ab71a3b153353aa2314 100644 (file)
--- a/arch/powerpc/mm/tlb_hash64.c
+++ b/arch/powerpc/mm/tlb_hash64.c
@@ -93,12 +93,10 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
 
        /*
         * Check if we have an active batch on this CPU. If not, just
-        * flush now and return. For now, we don global invalidates
-        * in that case, might be worth testing the mm cpu mask though
-        * and decide to use local invalidates instead...
+        * flush now and return.
         */
        if (!batch->active) {
-               flush_hash_page(vpn, rpte, psize, ssize, 0);
+               flush_hash_page(vpn, rpte, psize, ssize, mm_is_thread_local(mm));
                put_cpu_var(ppc64_tlb_batch);
                return;
        }