linux-kernel - Re: linux-next: Tree for Oct 5 (warnings: a. trace; b. mm/migrate)

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Date:   Wed, 6 Oct 2021 14:32:21 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: linux-next: Tree for Oct 5 (warnings: a. trace; b. mm/migrate)

On 10/6/21 2:22 PM, Steven Rostedt wrote:
> On Tue, 5 Oct 2021 13:46:52 -0700
> Randy Dunlap <rdunlap@...radead.org> wrote:
> 
>> a. randconfig: KCONFIG_SEED=0xBFBEA13C
>> ../kernel/trace/trace.c:1712:13: error: 'trace_create_maxlat_file' defined but not used [-Werror=unused-function]
>>    static void trace_create_maxlat_file(struct trace_array *tr,
> 
> Does this fix it?
> 
> -- Steve

Yes, thanks.

Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested


> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 7896d30d90f7..4520cbab0da5 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -1744,16 +1744,15 @@ void latency_fsnotify(struct trace_array *tr)
>   	irq_work_queue(&tr->fsnotify_irqwork);
>   }
>   
> -/*
> - * (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
> - *  defined(CONFIG_FSNOTIFY)
> - */
> -#else
> +/* CONFIG_FSNOTIFY else */
> +#elif CREATE_MAX_TRACE_FILE
>   
>   #define trace_create_maxlat_file(tr, d_tracer)				\
>   	trace_create_file("tracing_max_latency", 0644, d_tracer,	\
>   			  &tr->max_latency, &tracing_max_lat_fops)
>   
> +#else
> +#define trace_create_maxlat_file(tr, d_tracer) do { } while (0)
>   #endif
>   
>   #ifdef CONFIG_TRACER_MAX_TRACE
> @@ -9473,9 +9472,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
>   
>   	create_trace_options_dir(tr);
>   
> -#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
>   	trace_create_maxlat_file(tr, d_tracer);
> -#endif
>   
>   	if (ftrace_create_function_files(tr, d_tracer))
>   		MEM_FAIL(1, "Could not allocate function filter files");
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index b7c0f8e160fb..680935949aef 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -679,8 +679,11 @@ void update_max_tr_single(struct trace_array *tr,
>   #endif /* CONFIG_TRACER_MAX_TRACE */
>   
>   #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
> -	|| defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
> -#define LATENCY_FS_NOTIFY
> +	|| defined(CONFIG_OSNOISE_TRACER))
> +# define CREATE_MAX_TRACE_FILE
> +# ifdef CONFIG_FSNOTIFY
> +#  define LATENCY_FS_NOTIFY
> +# endif
>   #endif
>   
>   #ifdef LATENCY_FS_NOTIFY
> 


-- 
~Randy