Retire legacy debugging infrastructure

When the SPL was originally written Linux tracepoints were still
in their infancy.  Therefore, an entire debugging subsystem was
added to facilite tracing which served us well for many years.

Now that Linux tracepoints have matured they provide all the
functionality of the previous tracing subsystem.  Rather than
maintain parallel functionality it makes sense to fully adopt
tracepoints.  Therefore, this patch retires the legacy debugging
infrastructure.

See openzfs/zfs@bc9f413 for the tracepoint changes.

Signed-off-by: Ned Bass <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #408

cmd/Makefile.am

@@ -3,11 +3,8 @@ include $(top_srcdir)/config/Rules.am
 DEFAULT_INCLUDES += \
 	-I$(top_srcdir)/lib
 
-noinst_PROGRAMS = spl
 sbin_PROGRAMS = splat
 
-spl_SOURCES = spl.c
-
 splat_SOURCES = splat.c
 splat_LDFLAGS = $(top_builddir)/lib/libcommon.la
 

config/spl-build.m4

@@ -18,7 +18,6 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
 	AC_SUBST(KERNELCPPFLAGS)
 
 	SPL_AC_DEBUG
-	SPL_AC_DEBUG_LOG
 	SPL_AC_DEBUG_KMEM
 	SPL_AC_DEBUG_KMEM_TRACKING
 	SPL_AC_TEST_MODULE
@@ -219,7 +218,7 @@ AC_DEFUN([SPL_AC_RPM], [
 		AC_MSG_RESULT([$HAVE_RPMBUILD])
 	])
 
-	RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_LOG) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
+	RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
 	RPM_DEFINE_UTIL=
 	RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
 	RPM_DEFINE_DKMS=
@@ -452,39 +451,6 @@ AC_DEFUN([SPL_AC_DEBUG], [
 	AC_MSG_RESULT([$enable_debug])
 ])
 
-dnl #
-dnl # Enabled by default it provides a basic debug log infrastructure.
-dnl # Each subsystem registers itself with a name and logs messages
-dnl # using predefined types.  If the debug mask it set to allow the
-dnl # message type it will be written to the internal log.  The log
-dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
-dnl # after dumping the log it must be decoded using the spl utility.
-dnl #
-dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
-dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
-dnl #
-AC_DEFUN([SPL_AC_DEBUG_LOG], [
-	AC_ARG_ENABLE([debug-log],
-		[AS_HELP_STRING([--enable-debug-log],
-		[Enable basic debug logging @<:@default=yes@:>@])],
-		[],
-		[enable_debug_log=yes])
-
-	AS_IF([test "x$enable_debug_log" = xyes],
-	[
-		KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
-		DEBUG_LOG="_with_debug_log"
-		AC_DEFINE([DEBUG_LOG], [1],
-		[Define to 1 to enable basic debug logging])
-	], [
-		DEBUG_LOG="_without_debug_log"
-	])
-
-	AC_SUBST(DEBUG_LOG)
-	AC_MSG_CHECKING([whether basic debug logging is enabled])
-	AC_MSG_RESULT([$enable_debug_log])
-])
-
 dnl #
 dnl # Enabled by default it provides a minimal level of memory tracking.
 dnl # A total count of bytes allocated is kept for each alloc and free.

include/Makefile.am

@@ -5,8 +5,6 @@ COMMON_H =
 KERNEL_H = \
 	$(top_srcdir)/include/splat-ctl.h \
 	$(top_srcdir)/include/spl-ctl.h \
-	$(top_srcdir)/include/spl-debug.h \
-	$(top_srcdir)/include/spl-trace.h \
 	$(top_srcdir)/include/strings.h \
 	$(top_srcdir)/include/unistd.h