[PATCH 3.16 104/254] MIPS: MSA: bugfix - disable MSA correctly for new threads/processes.

[Ben Hutchings]

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ralf Baechle <r...@linux-mips.org>

commit 9cc719ab3f4f639d629ac8ff09e9b998bc006f68 upstream.

Due to the slightly odd way that new threads and processes start execution
when scheduled for the very first time they were bypassing the required
disable_msa call.

Signed-off-by: Ralf Baechle <r...@linux-mips.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 arch/mips/include/asm/switch_to.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/include/asm/switch_to.h
+++ b/arch/mips/include/asm/switch_to.h
@@ -101,7 +101,6 @@ do {                                                        
                \
        if (test_and_clear_tsk_thread_flag(prev, TIF_USEDMSA))          \
                __fpsave = FP_SAVE_VECTOR;                              \
        (last) = resume(prev, next, task_thread_info(next), __fpsave);  \
-       disable_msa();                                                  \
 } while (0)
 
 #define finish_arch_switch(prev)                                       \
@@ -119,6 +118,7 @@ do {                                                        
                \
        if (cpu_has_userlocal)                                          \
                write_c0_userlocal(current_thread_info()->tp_value);    \
        __restore_watch();                                              \
+       disable_msa();                                                  \
 } while (0)
 
 #endif /* _ASM_SWITCH_TO_H */