1 files changed, 12 insertions, 0 deletions

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 45d0b6b037ee..57028d49c202 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -705,6 +705,18 @@ int mips_set_process_fp_mode(struct task_struct *task, unsigned int value)
         struct task_struct *t;
         int max_users;
 
+        /* If nothing to change, return right away, successfully.  */
+        if (value == mips_get_process_fp_mode(task))
+                return 0;
+
+        /* Only accept a mode change if 64-bit FP enabled for o32.  */
+        if (!IS_ENABLED(CONFIG_MIPS_O32_FP64_SUPPORT))
+                return -EOPNOTSUPP;
+
+        /* And only for o32 tasks.  */
+        if (IS_ENABLED(CONFIG_64BIT) && !test_thread_flag(TIF_32BIT_REGS))
+                return -EOPNOTSUPP;
+
         /* Check the value is valid */
         if (value & ~known_bits)
                 return -EOPNOTSUPP;