[PATCH v3 3/3] trace.h: remove never-used TRACE_CONTEXT

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

The definition of "TRACE_CONTEXT" as "__FILE__" added in
e05bed960d3 (trace: add 'file:line' to all trace output, 2014-07-12)
appeared between v6[1] and v7[2] of the series that added it.

It does not appear to have been something anybody asked for, and
doesn't seem to have been used by anyone since then to override it to
something other than the default __FILE__.

When trace2 was added in ee4512ed481 (trace2: create new combined
trace facility, 2019-02-22) it added no such "configuration", and
we're unlikely to ever want to configure this through these means.

I.e. I have considered (and probably will) make the usage.c macros
support optional __FUNCTION__ at some point, that would need to have
them passed as "mandatory" parameters (which might default to NULL) to
the underlying function, for the reasons explained in the comment
being removed here.

So let's just remove this indirection in favor of using __FILE__
directly.

1. https://lore.kernel.org/git/53A4A2CD.8010003@gmail.com/
2. https://lore.kernel.org/git/53B33DED.3030809@gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 trace.h | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/trace.h b/trace.h
index 4e771f86ac2..5b52c1e23fd 100644
--- a/trace.h
+++ b/trace.h
@@ -126,19 +126,6 @@ void trace_command_performance(const char **argv);
 void trace_verbatim(struct trace_key *key, const void *buf, unsigned len);
 uint64_t trace_performance_enter(void);
 
-/*
- * TRACE_CONTEXT may be set to __FUNCTION__ if the compiler supports it. The
- * default is __FILE__, as it is consistent with assert(), and static function
- * names are not necessarily unique.
- *
- * __FILE__ ":" __FUNCTION__ doesn't work with GNUC, as __FILE__ is supplied
- * by the preprocessor as a string literal, and __FUNCTION__ is filled in by
- * the compiler as a string constant.
- */
-#ifndef TRACE_CONTEXT
-# define TRACE_CONTEXT __FILE__
-#endif
-
 /**
  * Macros to add the file:line of the calling code, instead of that of
  * the trace function itself.
@@ -171,7 +158,7 @@ uint64_t trace_performance_enter(void);
 #define trace_printf_key(key, ...)					    \
 	do {								    \
 		if (trace_pass_fl(key))					    \
-			trace_printf_key_fl(TRACE_CONTEXT, __LINE__, key,   \
+			trace_printf_key_fl(__FILE__, __LINE__, key,	    \
 					    __VA_ARGS__);		    \
 	} while (0)
 
@@ -183,7 +170,7 @@ uint64_t trace_performance_enter(void);
 #define trace_argv_printf(argv, ...)					    \
 	do {								    \
 		if (trace_pass_fl(&trace_default_key))			    \
-			trace_argv_printf_fl(TRACE_CONTEXT, __LINE__,	    \
+			trace_argv_printf_fl(__FILE__, __LINE__,	    \
 					    argv, __VA_ARGS__);		    \
 	} while (0)
 
@@ -196,7 +183,7 @@ uint64_t trace_performance_enter(void);
 #define trace_strbuf(key, data)						    \
 	do {								    \
 		if (trace_pass_fl(key))					    \
-			trace_strbuf_fl(TRACE_CONTEXT, __LINE__, key, data);\
+			trace_strbuf_fl(__FILE__, __LINE__, key, data);	    \
 	} while (0)
 
 /**
@@ -220,7 +207,7 @@ uint64_t trace_performance_enter(void);
 #define trace_performance(nanos, ...)					    \
 	do {								    \
 		if (trace_pass_fl(&trace_perf_key))			    \
-			trace_performance_fl(TRACE_CONTEXT, __LINE__, nanos,\
+			trace_performance_fl(__FILE__, __LINE__, nanos,	    \
 					     __VA_ARGS__);		    \
 	} while (0)
 
@@ -239,7 +226,7 @@ uint64_t trace_performance_enter(void);
 #define trace_performance_since(start, ...)				    \
 	do {								    \
 		if (trace_pass_fl(&trace_perf_key))			    \
-			trace_performance_fl(TRACE_CONTEXT, __LINE__,       \
+			trace_performance_fl(__FILE__, __LINE__,	    \
 					     getnanotime() - (start),	    \
 					     __VA_ARGS__);		    \
 	} while (0)
@@ -250,7 +237,7 @@ uint64_t trace_performance_enter(void);
 #define trace_performance_leave(...)					    \
 	do {								    \
 		if (trace_pass_fl(&trace_perf_key))			    \
-			trace_performance_leave_fl(TRACE_CONTEXT, __LINE__, \
+			trace_performance_leave_fl(__FILE__, __LINE__,	    \
 						   getnanotime(),	    \
 						   __VA_ARGS__);	    \
 	} while (0)
-- 
2.35.1.1129.g03fd99ecb8d