From: wangyangbo <wangyangbo@xxxxxxxxxxxxx> Create worker thread from original user task in mips, possibly copying FPU flag from user task, introducing save_fp when switch_to, triggering do_cpu trap. So clear USEDFPU flag for IO_WORKER in copy_thread. Signed-off-by: wangyangbo <yangbonis@xxxxxxxxxx> --- arch/mips/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 95aa86fa6077..0095006d48c7 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -135,6 +135,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, status |= ST0_EXL; #endif childregs->cp0_status = status; + + if (p->flags & PF_IO_WORKER) + clear_tsk_thread_flag(p, TIF_USEDFPU); return 0; } -- 2.20.1
