[MIPS] SMTC: Interrupt mask backstop hack

To support multiple TC microthreads acting as "CPUs" within a VPE,
VPE-wide interrupt mask bits must be specially manipulated during
interrupt handling. To support legacy drivers and interrupt controller
management code, SMTC has a "backstop" to track and if necessary restore
the interrupt mask. This has some performance impact on interrupt service
overhead. Disable it only if you know what you are doing.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index 297bd56c2347..c0f19d638b98 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -243,9 +243,11 @@ NESTED(except_vec_vi_handler, 0, sp)
          */
         mfc0    t1, CP0_STATUS
         and     t0, a0, t1
+#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
         mfc0    t2, CP0_TCCONTEXT
         or      t0, t0, t2
         mtc0    t0, CP0_TCCONTEXT
+#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */
         xor     t1, t1, t0
         mtc0    t1, CP0_STATUS
         _ehb