powerpc/mm: Add SMP support to no-hash TLB handling

This commit moves the whole no-hash TLB handling out of line into a
new tlb_nohash.c file, and implements some basic SMP support using
IPIs and/or broadcast tlbivax instructions.

Note that I'm using local invalidations for D->I cache coherency.

At worst, if another processor is trying to execute the same and
has the old entry in its TLB, it will just take a fault and re-do
the TLB flush locally (it won't re-do the cache flush in any case).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 7df0409107ad..87f1f955dea4 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -284,7 +284,7 @@ good_area:
                                 }
                                 pte_update(ptep, 0, _PAGE_HWEXEC |
                                            _PAGE_ACCESSED);
-                                _tlbie(address, mm->context.id);
+                                local_flush_tlb_page(vma, address);
                                 pte_unmap_unlock(ptep, ptl);
                                 up_read(&mm->mmap_sem);
                                 return 0;