linux-kernel - Re: [PATCH 7/7] cxl/trace: Enclose a multiple statements macro in a do while loop

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Message-ID: <ZQ1dsMjS4RBJxi1X@jtpark-7920>
Date:   Fri, 22 Sep 2023 18:26:08 +0900
From:   Jeongtae Park <jtp.park@...sung.com>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Fan Ni <fan.ni@...sung.com>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kyungsan Kim <ks0204.kim@...sung.com>,
        Wonjae Lee <wj28.lee@...sung.com>,
        Hojin Nam <hj96.nam@...sung.com>,
        Junhyeok Im <junhyeok.im@...sung.com>,
        Jehoon Park <jehoon.park@...sung.com>,
        Jeongtae Park <jeongtae.park@...il.com>
Subject: Re: [PATCH 7/7] cxl/trace: Enclose a multiple statements macro in a
 do while loop

On Thu, Sep 21, 2023 at 03:58:26PM -0700, Dave Jiang wrote:
> 
> 
> On 9/20/23 19:51, Jeongtae Park wrote:
> > ERROR: Macros with complex values should be enclosed in parentheses
> > 
> > Signed-off-by: Jeongtae Park <jtp.park@...sung.com>
> 
> I think that goes against typical traceevent macros layout. I would ignore checkpatch warnings on traceevent stuff. 
> 
>

Ok, I see, I will drop this change.

> > ---
> >  drivers/cxl/core/trace.h | 24 +++++++++++++-----------
> >  1 file changed, 13 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
> > index 7aee7fb008a5..e2338773dcd6 100644
> > --- a/drivers/cxl/core/trace.h
> > +++ b/drivers/cxl/core/trace.h
> > @@ -199,17 +199,19 @@ TRACE_EVENT(cxl_overflow,
> >  	__field(u8, hdr_maint_op_class)
> >  
> >  #define CXL_EVT_TP_fast_assign(cxlmd, l, hdr)					\
> > -	__assign_str(memdev, dev_name(&(cxlmd)->dev));				\
> > -	__assign_str(host, dev_name((cxlmd)->dev.parent));			\
> > -	__entry->log = (l);							\
> > -	__entry->serial = (cxlmd)->cxlds->serial;				\
> > -	memcpy(&__entry->hdr_uuid, &(hdr).id, sizeof(uuid_t));			\
> > -	__entry->hdr_length = (hdr).length;					\
> > -	__entry->hdr_flags = get_unaligned_le24((hdr).flags);			\
> > -	__entry->hdr_handle = le16_to_cpu((hdr).handle);			\
> > -	__entry->hdr_related_handle = le16_to_cpu((hdr).related_handle);	\
> > -	__entry->hdr_timestamp = le64_to_cpu((hdr).timestamp);			\
> > -	__entry->hdr_maint_op_class = (hdr).maint_op_class
> > +	do {									\
> > +	    __assign_str(memdev, dev_name(&(cxlmd)->dev));			\
> > +	    __assign_str(host, dev_name((cxlmd)->dev.parent));			\
> > +	    __entry->log = (l);							\
> > +	    __entry->serial = (cxlmd)->cxlds->serial;				\
> > +	    memcpy(&__entry->hdr_uuid, &(hdr).id, sizeof(uuid_t));		\
> > +	    __entry->hdr_length = (hdr).length;					\
> > +	    __entry->hdr_flags = get_unaligned_le24((hdr).flags);		\
> > +	    __entry->hdr_handle = le16_to_cpu((hdr).handle);			\
> > +	    __entry->hdr_related_handle = le16_to_cpu((hdr).related_handle);	\
> > +	    __entry->hdr_timestamp = le64_to_cpu((hdr).timestamp);		\
> > +	    __entry->hdr_maint_op_class = (hdr).maint_op_class;			\
> > +	} while (0)
> >  
> >  #define CXL_EVT_TP_printk(fmt, ...) \
> >  	TP_printk("memdev=%s host=%s serial=%lld log=%s : time=%llu uuid=%pUb "	\