[MIPS] R2: Instruction hazard barrier.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 371571f4f280..b1939a486d2c 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -119,3 +119,18 @@ syscall_exit_work:
         li      a1, 1
         jal     do_syscall_trace
         b       resume_userspace
+
+#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT)
+
+/*
+ * MIPS32R2 Instruction Hazard Barrier - must be called
+ *
+ * For C code use the inline version named instruction_hazard().
+ */
+LEAF(mips_ihb)
+        .set    mips32r2
+        jr.hb   ra
+        nop
+        END(mips_ihb)
+
+#endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */