From: Priyanka Jain <Priyanka.Jain@xxxxxxxxxxxxx> In ret_from_except_lite() with CONFIG_PREEMPT enabled, add the missing check to compare value of preempt_count with zero before continuing with preemption process of the current task. If preempt_count is non-zero, restore reg and return, else continue the preemption process. Cc: stable-rt@xxxxxxxxxxxxxxx Signed-off-by: Priyanka Jain <Priyanka.Jain@xxxxxxxxxxxxx> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> --- arch/powerpc/kernel/entry_64.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index a9b98cc..7af1ea7 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -596,6 +596,8 @@ resume_kernel: #ifdef CONFIG_PREEMPT /* Check if we need to preempt */ lwz r8,TI_PREEMPT(r9) + cmpwi 0,r8,0 /* if non-zero, just restore regs and return */ + bne restore andi. r0,r4,_TIF_NEED_RESCHED bne+ 1f -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
