powerpc/mm: ppc 603 doesn't need update_mmu_cache()

On powerpc 603, there is no hash table so get out of
update_mmu_cache() early.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6133e0f115d955fac4061536dab0fa7480a1c433.1565933217.git.christophe.leroy@c-s.fr

diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index 5d7d35eb96fba4c1285dde2d49645391893233a3..50a1991d257f55f8dfe02baa55ba10c160827181 100644 (file)
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -319,6 +319,8 @@ void hash_preload(struct mm_struct *mm, unsigned long ea)
 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
                      pte_t *ptep)
 {
+       if (!mmu_has_feature(MMU_FTR_HPTE_TABLE))
+               return;
        /*
         * We don't need to worry about _PAGE_PRESENT here because we are
         * called with either mm->page_table_lock held or ptl lock held