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....@linux.intel.com>
>> Acked-by: Heiko Carstens <heiko.carst...@de.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().
Regards!
Gerry
>> + if (test_bit(ec_call_function, &bits))
>> + generic_smp_call_function_interrupt();
>> }
>>
>> static void do_ext_call_interrupt(struct ext_code ext_code,
>> @@ -432,12 +432,12 @@ void arch_send_call_function_ipi_mask(const struct
>> cpumask *mask)
>> int cpu;
>>
>> for_each_cpu(cpu, mask)
>> - pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
>> + pcpu_ec_call(pcpu_devices + cpu, ec_call_function);
>> }
>>
>> void arch_send_call_function_single_ipi(int cpu)
>> {
>> - pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
>> + pcpu_ec_call(pcpu_devices + cpu, ec_call_function);
>> }
>>
>> #ifndef CONFIG_64BIT
>> --
>> 1.7.10.4
>>
>
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