linux-kernel - Re: [EXT] Re: [PATCH v3 1/1] tracing: Fix compile error in trace

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Date:   Thu, 8 Sep 2022 12:12:24 -0700
From:   Arun Easi <aeasi@...vell.com>
To:     Bart Van Assche <bvanassche@....org>,
        Steven Rostedt <rostedt@...dmis.org>
CC:     Martin Petersen <martin.petersen@...cle.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-next@...r.kernel.org>,
        <GR-QLogic-Storage-Upstream@...vell.com>
Subject: Re: [EXT] Re: [PATCH v3 1/1] tracing: Fix compile error in trace_array
 calls when TRACING is disabled

On Thu, 8 Sep 2022, 9:55am, Bart Van Assche wrote:

> 
> ----------------------------------------------------------------------
> On 9/7/22 16:33, Arun Easi wrote:
> > diff --git a/include/linux/trace.h b/include/linux/trace.h
> > index bf16961..b5e16e4 100644
> > --- a/include/linux/trace.h
> > +++ b/include/linux/trace.h
> > @@ -2,8 +2,6 @@
> >   #ifndef _LINUX_TRACE_H
> >   #define _LINUX_TRACE_H
> >   -#ifdef CONFIG_TRACING
> > -
> >   #define TRACE_EXPORT_FUNCTION	BIT(0)
> >   #define TRACE_EXPORT_EVENT	BIT(1)
> >   #define TRACE_EXPORT_MARKER	BIT(2)
> > @@ -28,6 +26,8 @@ struct trace_export {
> >   	int flags;
> >   };
> >   +#ifdef CONFIG_TRACING
> > +
> >   int register_ftrace_export(struct trace_export *export);
> >   int unregister_ftrace_export(struct trace_export *export);
> >   @@ -48,6 +48,38 @@ void osnoise_arch_unregister(void);
> >   void osnoise_trace_irq_entry(int id);
> >   void osnoise_trace_irq_exit(int id, const char *desc);
> >   +#else /* CONFIG_TRACING */
> > +static inline int register_ftrace_export(struct trace_export *export)
> > +{
> > +	return -EINVAL;
> > +}
> > +static inline int unregister_ftrace_export(struct trace_export *export)
> > +{
> > +	return 0;
> > +}
> > +static inline void trace_printk_init_buffers(void)
> > +{
> > +}
> > +static inline int trace_array_printk(struct trace_array *tr, unsigned long
> > ip,
> > +				     const char *fmt, ...)
> > +{
> > +	return 0;
> > +}
> > +static inline int trace_array_init_printk(struct trace_array *tr)
> > +{
> > +	return -EINVAL;
> > +}
> > +static inline void trace_array_put(struct trace_array *tr)
> > +{
> > +}
> > +static inline struct trace_array *trace_array_get_by_name(const char *name)
> > +{
> > +	return NULL;
> > +}
> > +static inline int trace_array_destroy(struct trace_array *tr)
> > +{
> > +	return 0;
> > +}
> >   #endif	/* CONFIG_TRACING */
> >     #endif	/* _LINUX_TRACE_H */
> 
> Thanks for having addressed my feedback. The above looks good to me. However,
> I'm not very familiar with the tracing framework so I will leave it to others
> to formally review this patch.
> 

Thanks for the review and suggestion of the clang-format command line, 
Bart. That is a useful one to remember.

Steve, does this look ok? If so, your approval is appreciated, as this is 
a build blocker fix.

Regards,
-Arun