linux-kernel - Re: [Resend Patch v4 14/16] smp, s390: Kill SMP single function call interrupt

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Date:	Fri, 23 Jan 2015 10:32:00 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org
Subject: Re: [Resend Patch v4 14/16] smp, s390: Kill SMP single function call
 interrupt

On Fri, Jan 23, 2015 at 05:21:42PM +0800, Jiang Liu wrote:
> On 2015/1/23 14:54, Heiko Carstens wrote:
> > On Fri, Jan 23, 2015 at 01:36:53PM +0800, Jiang Liu wrote:
> >> Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
> >> similar to smp_call_function_single()" has unified the way to handle
> >> single and multiple cross-CPU function calls. Now only one interrupt
> >> is needed for architecture specific code to support generic SMP function
> >> call interfaces, so kill the redundant single function call interrupt.
> >>
> >> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> >> Acked-by: Heiko Carstens <heiko.carst...@...ibm.com>
> > 
> > Is this really the patch I acked, whenever that was? Because the patch
> > description doesn't match what your patch does.
> > All it does is renaming ec_call_function_single to ec_call_function,
> > nothing else.
> > 
> > Could you please resend with a proper patch description?
> > Thanks!
> > 
> >> ---
> >>  arch/s390/kernel/smp.c |   10 +++++-----
> >>  1 file changed, 5 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
> >> index 0b499f5cbe19..5b89eabc3a01 100644
> >> --- a/arch/s390/kernel/smp.c
> >> +++ b/arch/s390/kernel/smp.c
> >> @@ -50,7 +50,7 @@
> >>
> >>  enum {
> >>  	ec_schedule = 0,
> >> -	ec_call_function_single,
> >> +	ec_call_function,
> >>  	ec_stop_cpu,
> >>  };
> >>
> >> @@ -416,8 +416,8 @@ static void smp_handle_ext_call(void)
> >>  		smp_stop_cpu();
> >>  	if (test_bit(ec_schedule, &bits))
> >>  		scheduler_ipi();
> >> -	if (test_bit(ec_call_function_single, &bits))
> >> -		generic_smp_call_function_single_interrupt();
> HI Heiko,
> 	The background is that the generic smp_call_xxx() interfaces
> only use on interrupt now, previously it used two (FUNC_CALL and
> FUNC_CALL_SINGLE). So the whole patch set is to kill
> FUNC_CALL_SINGLE from all architectures.
> 	Above code kills generic_smp_call_function_single_interrupt().
> We also replaces ec_call_function_single with ec_call_function so
> only one interrupt will be used to support smp_call_xxx().

Ah right, I missed that while looking at your patch. Apologies!

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