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From:   Valentin Schneider <vschneid@redhat.com>
To:     Peter Zijlstra <peterz@infradead.org>
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Subject: Re: [RFC PATCH v2 4/8] smp: Trace IPIs sent via
 arch_send_call_function_ipi_mask()
In-Reply-To: <Y3X5/65o8127DgZl@hirez.programming.kicks-ass.net>
References: <20221102182949.3119584-1-vschneid@redhat.com>
 <20221102183336.3120536-3-vschneid@redhat.com>
 <Y3X5/65o8127DgZl@hirez.programming.kicks-ass.net>
Date:   Thu, 17 Nov 2022 14:23:55 +0000
Message-ID: <xhsmhk03ty804.mognet@vschneid.remote.csb>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On 17/11/22 10:08, Peter Zijlstra wrote:
> On Wed, Nov 02, 2022 at 06:33:32PM +0000, Valentin Schneider wrote:
>> This simply wraps around the arch function and prepends it with a
>> tracepoint, similar to send_call_function_single_ipi().
>>
>> Signed-off-by: Valentin Schneider <vschneid@redhat.com>
>> ---
>>  kernel/smp.c | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/smp.c b/kernel/smp.c
>> index e2ca1e2f31274..c4d561cf50d45 100644
>> --- a/kernel/smp.c
>> +++ b/kernel/smp.c
>> @@ -160,6 +160,13 @@ void __init call_function_init(void)
>>      smpcfd_prepare_cpu(smp_processor_id());
>>  }
>>
>> +static inline void
>
> Given the use of _RET_IP_, I would strongly recommend you use
> __always_inline.
>

Noted, thanks

>> +send_call_function_ipi_mask(const struct cpumask *mask)
>> +{
>> +	trace_ipi_send_cpumask(mask, _RET_IP_, func);
>
> What's func?
>

A rebase fail... That's only plugged in later.

>> +	arch_send_call_function_ipi_mask(mask);
>> +}