linux-kernel - Re: [PATCH V2 02/11] cxl/mem: Implement Get Event Records command

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Date:   Thu, 1 Dec 2022 23:40:52 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ira Weiny <ira.weiny@...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>,
        "Dave Jiang" <dave.jiang@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH V2 02/11] cxl/mem: Implement Get Event Records command

On Thu, 1 Dec 2022 16:09:17 -0800
Ira Weiny <ira.weiny@...el.com> wrote:

> Dropping that into cxlmem.h does not compile.  I've given it another go but
> because I use cxl_event_log_type_str() in a file where trace points are used
> CREATE_TRACE_POINTS is defined and I get the following error.
> 
> || drivers/cxl/core/mbox.c: In function ‘cxl_mem_get_records_log’:
> drivers/cxl/cxlmem.h|386 col 7| error: implicit declaration of function ‘__print_symbolic’; did you mean ‘sprint_symbol’?  [-Werror=implicit-function-declaration]                        
> ||   386 |       __print_symbolic(type,                            \
> ||       |       ^~~~~~~~~~~~~~~~
> 
> I got it to work with the patch below on top of this one.[3]  But it is kind of
> ugly.  The only way I could get __print_symbolic() to be defined was to
> redefine it in mbox.c.[1]  Then throw it in it's own header as in [3]

I played around a bit, and with the below patch, you can just have:


#define cxl_event_log_type_str(type)				\
	__print_symbolic(type,					\
		{ CXL_EVENT_TYPE_INFO, "Informational" },	\
		{ CXL_EVENT_TYPE_WARN, "Warning" },		\
		{ CXL_EVENT_TYPE_FAIL, "Failure" },		\
		{ CXL_EVENT_TYPE_FATAL, "Fatal" })

And everything else should "just work" :-)

I can work on a more formal patch if this works for you. And thinking about
this, perhaps we could add this throughout the kernel!

-- Steve

diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index 00723935dcc7..ee41057674a2 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -132,4 +132,25 @@
 /* We may be processing more files */
 #define CREATE_TRACE_POINTS
 
+#ifndef __DEFINE_PRINT_SYMBOLIC_STR
+#define __DEFINE_PRINT_SYMBOLIC_STR
+static inline const char *
+__print_symbolic_str(int type, struct trace_print_flags *symbols)
+{
+	for (; symbols->name != NULL; symbols++) {
+		if (type == symbols->mask)
+			return symbols->name;
+	}
+	return "<invalid>";
+}
+#endif
+
+#undef __print_symbolic
+#define __print_symbolic(value, symbol_array...)			\
+	({								\
+		static const struct trace_print_flags symbols[] =	\
+			{ symbol_array, { -1, NULL }};			\
+		__print_symbolic_str(value, symbols);			\
+	})
+
 #endif /* CREATE_TRACE_POINTS */
diff --git a/include/trace/stages/stage7_class_define.h b/include/trace/stages/stage7_class_define.h
index 8a7ec24c246d..6fe83397f65d 100644
--- a/include/trace/stages/stage7_class_define.h
+++ b/include/trace/stages/stage7_class_define.h
@@ -6,7 +6,6 @@
 #define __entry REC
 
 #undef __print_flags
-#undef __print_symbolic
 #undef __print_hex
 #undef __print_hex_str
 #undef __get_dynamic_array