Merge branch 'for-5.1/nfit/ars' into libnvdimm-for-next

Merge several updates to the ARS implementation. Highlights include:

* Support retrieval of short-ARS results if the ARS state is "requires
  continuation", and even if the "no_init_ars" module parameter is
  specified.
* Allow busy-polling of the kernel ARS state by allowing root to reset
  the exponential back-off timer.
* Filter potentially stale ARS results by tracking query-ARS relative to
  the previous start-ARS.

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 57933fc8fd98..910851c62db3 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -228,6 +228,7 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
                         : [global] "r" (page_global));
                 } else if (kernel_uses_llsc) {
+                        loongson_llsc_mb();
                         __asm__ __volatile__ (
                         "       .set    push                            \n"
                         "       .set    "MIPS_ISA_ARCH_LEVEL"           \n"
@@ -242,6 +243,7 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
                         "       .set    pop                             \n"
                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
                         : [global] "r" (page_global));
+                        loongson_llsc_mb();
                 }
 #else /* !CONFIG_SMP */
                 if (pte_none(*buddy))