Autoconf --enable-debug-* cleanup

Cleanup the --enable-debug-* configure options, this has been pending
for quite some time and I am glad I finally got to it.  To summerize:

1) All SPL_AC_DEBUG_* macros were updated to be a more autoconf
friendly.  This mainly involved shift to the GNU approved usage of
AC_ARG_ENABLE and ensuring AS_IF is used rather than directly using
an if [ test ] construct.

2) --enable-debug-kmem=yes by default.  This simply enabled keeping
a running tally of total memory allocated and freed and reporting a
memory leak if there was one at module unload.  Additionally, it
ensure /proc/spl/kmem/slab will exist by default which is handy.
The overhead is low for this and it should not impact performance.

3) --enable-debug-kmem-tracking=no by default.  This option was added
to provide a configure option to enable to detailed memory allocation
tracking.  This support was always there but you had to know where to
turn it on.  By default this support is disabled because it is known
to badly hurt performence, however it is invaluable when chasing a
memory leak.

4) --enable-debug-kstat removed.  After further reflection I can't see
why you would ever really want to turn this support off.  It is now
always on which had the nice side effect of simplifying the proc handling
code in spl-proc.c.  We can now always assume the top level directory
will be there.

5) --enable-debug-callb removed.  This never really did anything, it was
put in provisionally because it might have been needed.  It turns out
it was not so I am just removing it to prevent confusion.

include/sys/callb.h

@@ -8,11 +8,7 @@ extern "C" {
 #include <linux/module.h>
 #include <sys/mutex.h>
 
-#ifdef DEBUG_CALLB
 #define CALLB_CPR_ASSERT(cp)		ASSERT(MUTEX_HELD((cp)->cc_lockp));
-#else
-#define CALLB_CPR_ASSERT(cp)		(void)0
-#endif
 
 typedef struct callb_cpr {
         kmutex_t        *cc_lockp;

include/sys/kmem.h

@@ -32,7 +32,6 @@ extern "C" {
 #endif
 
 #undef DEBUG_KMEM_UNIMPLEMENTED
-#undef DEBUG_KMEM_TRACKING /* Per-allocation memory tracking */
 
 #include <linux/module.h>
 #include <linux/slab.h>

include/sys/kstat.h

@@ -27,10 +27,6 @@
 #ifndef _SPL_KSTAT_H
 #define _SPL_KSTAT_H
 
-#ifdef  __cplusplus
-extern "C" {
-#endif
-
 #include <linux/module.h>
 #include <sys/types.h>
 #include <sys/time.h>
@@ -155,7 +151,6 @@ typedef struct kstat_timer {
 int kstat_init(void);
 void kstat_fini(void);
 
-#ifdef DEBUG_KSTAT
 extern kstat_t *__kstat_create(const char *ks_module, int ks_instance,
 			     const char *ks_name, const char *ks_class,
 			     uchar_t ks_type, uint_t ks_ndata,
@@ -167,17 +162,5 @@ extern void __kstat_delete(kstat_t *ksp);
 #define kstat_install(k)		__kstat_install(k)
 #define kstat_delete(k)			__kstat_delete(k)
 
-#else
-
-#define kstat_create(m,i,n,c,t,s,f)	(NULL)
-#define kstat_install(k)		((void)0)
-#define kstat_delete(k)			((void)0)
-
-#endif /* DEBUG_KSTAT */
-
-#ifdef  __cplusplus
-}
-#endif
-
 #endif  /* _SPL_KSTAT_H */
 

include/sys/proc.h

@@ -48,12 +48,10 @@
 #define spl_unregister_sysctl_table(t)	unregister_sysctl_table(t)
 #endif /* CONFIG_SYSCTL */
 
-#ifdef DEBUG_KSTAT
 extern struct proc_dir_entry *proc_spl_kstat;
 struct proc_dir_entry *proc_dir_entry_find(struct proc_dir_entry *root,
 					   const char *str);
 int proc_dir_entries(struct proc_dir_entry *root);
-#endif
 
 int proc_init(void);
 void proc_fini(void);