Messages in this thread Patch in this message | | | From | wangyangbo <> | Subject | [PATCH 1/1] MIPS: Fix fpu trap invoked by io-worker | Date | Mon, 13 Sep 2021 13:37:17 +0800 |
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From: wangyangbo <wangyangbo@uniontech.com>
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@icloud.com> --- 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
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