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Subject: Re: [PATCH v3] tools/lib/traceevent, perf tools: Handle %pU format
 correctly
To:     Steven Rostedt <rostedt@goodmis.org>, Qu Wenruo <wqu@suse.com>
Cc:     linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-trace-devel@vger.kernel.org
References: <20191021094730.57332-1-wqu@suse.com>
 <20191021095625.2dfe3359@gandalf.local.home>
From:   Qu Wenruo <quwenruo.btrfs@gmx.com>
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Message-ID: <3830b0c5-5b76-36c1-5e3a-64dad62f76fb@gmx.com>
Date:   Mon, 21 Oct 2019 22:03:21 +0800
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On 2019/10/21 =E4=B8=8B=E5=8D=889:56, Steven Rostedt wrote:
> On Mon, 21 Oct 2019 17:47:30 +0800
> Qu Wenruo <wqu@suse.com> wrote:
>=20
>> +static void print_uuid_arg(struct trace_seq *s, void *data, int size,=

>> +			   struct tep_event *event, struct tep_print_arg *arg)
>> +{
>> +	unsigned char *buf;
>> +	int i;
>> +
>> +	if (arg->type !=3D TEP_PRINT_FIELD) {
>> +		trace_seq_printf(s, "ARG TYPE NOT FIELID but %d", arg->type);
>> +		return;
>> +	}
>> +
>> +	if (!arg->field.field) {
>> +		arg->field.field =3D tep_find_any_field(event, arg->field.name);
>> +		if (!arg->field.field) {
>> +			do_warning("%s: field %s not found",
>> +				   __func__, arg->field.name);
>> +			return;
>> +		}
>> +	}
>> +	if (arg->field.field->size < 16) {
>> +		trace_seq_printf(s, "INVALID UUID: size have %u expect 16",
>> +				arg->field.field->size);
>> +		return;
>> +	}
>> +	buf =3D data + arg->field.field->offset;
>> +
>> +	for (i =3D 0; i < 8; i++) {
>> +		trace_seq_printf(s, "%02x", buf[2 * i]);
>> +		trace_seq_printf(s, "%02x", buf[2 * i + 1]);
>> +		if (1 <=3D i && i <=3D 4)
>=20
> I'm fine with this patch except for one nit. The above is hard to read
> (in my opinion), and I absolutely hate the "constant" compare to
> "variable" notation. Please change the above to:
>=20
> 		if (i >=3D 1 && i <=3D 4)

Isn't this ( 1 <=3D i && i <=3D 4 ) easier to find out the lower and uppe=
r
boundary? only two numbers, both at the end of the expression.

I feel that ( i >=3D 1 && i <=3D 4 ) easier to write, but takes me extra
half second to read, thus I changed to the current one.

Thanks,
Qu

>=20
> Thanks,
>=20
> -- Steve
>=20
>> +			trace_seq_putc(s, '-');
>> +	}
>> +}
>> +


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