Remove shrink_{i,d}node_cache() wrappers

This is optional functionality which may or may not be useful to
ZFS when using older kernels.  It is never a hard requirement.
Therefore this functionality is being removed from the SPL and
a simpler slimmed down version will be added to ZFS.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

include/sys/dnlc.h

@@ -25,22 +25,4 @@
 #ifndef _SPL_DNLC_H
 #define _SPL_DNLC_H
 
-/*
- * Reduce the dcache and icache then reap the free'd slabs.  Note the
- * interface takes a reclaim percentage but we don't have easy access to
- * the total number of entries to calculate the reclaim count.  However,
- * in practice this doesn't need to be even close to correct.  We simply
- * need to reclaim some useful fraction of the cache.  The caller can
- * determine if more needs to be done.
- */
-static inline void
-dnlc_reduce_cache(void *reduce_percent)
-{
-	int nr = (uintptr_t)reduce_percent * 10000;
-
-	shrink_dcache_memory(nr, GFP_KERNEL);
-	shrink_icache_memory(nr, GFP_KERNEL);
-	kmem_reap();
-}
-
 #endif /* SPL_DNLC_H */

include/sys/kmem.h

@@ -498,7 +498,6 @@ extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
 extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count);
 extern void spl_kmem_reap(void);
 
-int spl_kmem_init_kallsyms_lookup(void);
 int spl_kmem_init(void);
 void spl_kmem_fini(void);