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@xxxxxxxxxx> Cc: Matthew Fortune <matthew.fortune@xxxxxxxxxx> Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx> --- arch/mips/include/asm/fpu.h | 3 ++- arch/mips/kernel/process.c | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/mips/include/asm/fpu.h b/arch/mips/include/asm/fpu.h index 994d21939676..b96d9d327626 100644 --- a/arch/mips/include/asm/fpu.h +++ b/arch/mips/include/asm/fpu.h @@ -68,7 +68,8 @@ static inline int __enable_fpu(enum fpu_mode mode) goto fr_common; case FPU_64BIT: -#if !(defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_64BIT)) +#if !(defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS32_R6) \ + || defined(CONFIG_64BIT)) /* we only have a 32-bit FPU */ return SIGFPE; #endif diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index b732c0ce2e56..41ebd5d0ac30 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_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); -- 2.2.1
