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authorMarkos Chandras <markos.chandras@imgtec.com>2015-01-13 13:01:49 +0000
committerMarkos Chandras <markos.chandras@imgtec.com>2015-02-17 15:37:38 +0000
commit13e45f095753b8203a8446648dea527f9ce4413c (patch)
treeb81e48b104b14339e0f5409a1a5ecdb816a1c36d
parente0d32f33e651a393a23826c06a9301917372f3e2 (diff)
MIPS: kernel: process: Do not allow FR=0 on MIPS R6
A prctl() call to set FR=0 for MIPS R6 should not be allowed since FR=1 is the only option for R6 cores. Cc: Paul Burton <paul.burton@imgtec.com> Cc: Matthew Fortune <matthew.fortune@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
-rw-r--r--arch/mips/kernel/process.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 4677b4c67da6..696d59e40fa4 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -581,6 +581,10 @@ int mips_set_process_fp_mode(struct task_struct *task, unsigned int value)
if ((value & PR_FP_MODE_FRE) && cpu_has_fpu && !cpu_has_fre)
return -EOPNOTSUPP;
+ /* FR = 0 not supported in MIPS R6 */
+ if (!(value & PR_FP_MODE_FR) && cpu_has_fpu && cpu_has_mips_r6)
+ return -EOPNOTSUPP;
+
/* Save FP & vector context, then disable FPU & MSA */
if (task->signal == current->signal)
lose_fpu(1);