MIPS: Properly disable FPU in start_thread()

start_thread() (called for execve(2)) clears the TIF_USEDFPU flag
without atomically disabling the FPU. With a preemptive kernel, an
unfortunately timed preemption after this could result in another
task (or KVM guest) being scheduled in with the FPU still enabled, since
lose_fpu_inatomic() only turns it off if TIF_USEDFPU is set.

Use lose_fpu(0) instead of the separate FPU / MSA management, which
should do the right thing (drop FPU properly and atomically without
saving state) and will be more future proof.

Signed-off-by: James Hogan <[e-mail]>
Reviewed-by: Paul Burton <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/12302/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/kernel/process.c

···
 	status = regs->cp0_status & ~(ST0_CU0|ST0_CU1|ST0_FR|KU_MASK);
 	status |= KU_USER;
 	regs->cp0_status = status;
-	clear_used_math();
-	clear_fpu_owner();
-	init_dsp();
-	clear_thread_flag(TIF_USEDMSA);
+	lose_fpu(0);
 	clear_thread_flag(TIF_MSA_CTX_LIVE);
-	disable_msa();
+	clear_used_math();
+	init_dsp();
 	regs->cp0_epc = pc;
 	regs->regs[29] = sp;
 }