Please ignore this patch. I have send another patch with updated description. > -----Original Message----- > From: Jain Priyanka-B32167 > Sent: Monday, April 15, 2013 11:17 AM > To: linux-rt-users@xxxxxxxxxxxxxxx > Cc: Jain Priyanka-B32167 > Subject: [PATCH] powerpc/64bit,PREEMPT_RT: Check preempt_count before > preempting > > 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. > > Signed-off-by: Priyanka Jain <Priyanka.Jain@xxxxxxxxxxxxx> Fixes > CQ:ENGR257848 > CONFIG_PREEMPT_RT_FULL does not work on 64-bit > --- > arch/powerpc/kernel/entry_64.S | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/kernel/entry_64.S > b/arch/powerpc/kernel/entry_64.S index 1b1c8ae..ec120e6 100644 > --- a/arch/powerpc/kernel/entry_64.S > +++ b/arch/powerpc/kernel/entry_64.S > @@ -643,6 +643,8 @@ 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+ check_count > > -- > 1.7.4.1 -- 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
