Re: [PATCH v3 perf, bpf-next 1/4] perf, bpf: Introduce PERF_RECORD_BPF_EVENT

[Song Liu]

> On Dec 12, 2018, at 4:06 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
> On Tue, Dec 11, 2018 at 03:33:47PM -0800, Song Liu wrote:
>> +static void perf_event_bpf_output(struct perf_event *event,
>> +				   void *data)
>> +{
>> +	struct perf_bpf_event *bpf_event = data;
>> +	struct perf_output_handle handle;
>> +	struct perf_sample_data sample;
>> +	char name[KSYM_NAME_LEN];
>> +	int name_len;
>> +	int ret;
>> +
>> +	if (!perf_event_bpf_match(event))
>> +		return;
>> +
>> +	/* get prog name and round up to 64 bit aligned */
>> +	bpf_get_prog_name(bpf_event->prog, name);
>> +	name_len = strlen(name) + 1;
>> +	while (!IS_ALIGNED(name_len, sizeof(u64)))
>> +		name[name_len++] = '\0';
> 
> Does this not require something like:
> 
> 	BUILD_BUG_ON(KSYM_NAME_LEN % sizeof(u64));

Yeah, this makes sense. I will add this in next version. 

Thanks,
Song