linux-kernel - Re: [PATCH v4] block: Add ioprio to block

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Date: Tue, 11 Jun 2024 10:09:12 -0700
From: Bart Van Assche <bvanassche@....org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Dongliang Cui <dongliang.cui@...soc.com>, axboe@...nel.dk,
 mhiramat@...nel.org, mathieu.desnoyers@...icios.com, ebiggers@...nel.org,
 ke.wang@...soc.com, hongyu.jin.cn@...il.com, niuzhiguo84@...il.com,
 hao_hao.wang@...soc.com, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, akailash@...gle.com, cuidongliang390@...il.com
Subject: Re: [PATCH v4] block: Add ioprio to block_rq tracepoint

On 6/11/24 9:54 AM, Steven Rostedt wrote:
> On Tue, 11 Jun 2024 09:26:54 -0700
> Bart Van Assche <bvanassche@....org> wrote:
> 
>> On 6/11/24 12:35 AM, Dongliang Cui wrote:
>>> +#define IOPRIO_CLASS_STRINGS \
>>> +	{ IOPRIO_CLASS_NONE,	"none" }, \
>>> +	{ IOPRIO_CLASS_RT,	"rt" }, \
>>> +	{ IOPRIO_CLASS_BE,	"be" }, \
>>> +	{ IOPRIO_CLASS_IDLE,	"idle" }, \
>>> +	{ IOPRIO_CLASS_INVALID,	"invalid"}
>>
>> Shouldn't this array be defined in a C file instead of in a header file?
> 
> The way the TRACE_EVENT() macro works, this will not work in a C file.

Hmm ... if the above array is terminated with a { -1, NULL } sentinel and if
__print_symbolic() is changed into trace_print_symbols_seq(p, ...) then the above
array can be moved into a C file, isn't it?

Thanks,

Bart.