Add memory compatibility wrappers

The function vmem_qcache_reap() and global variables 'needfree',
'desfree', and 'lotsfree' are all used in the upstream.  While
these variables have no meaning under Linux they're being defined
as 0's to avoid needing to make additional changes to the ARC code.

Signed-off-by: Brian Behlendorf <[email protected]>

include/sys/vmem.h

@@ -98,6 +98,7 @@ extern void *spl_vmalloc(unsigned long size, gfp_t lflags, pgprot_t prot);
 #define vmem_alloc(sz, fl) spl_vmem_alloc((sz), (fl), __func__, __LINE__)
 #define vmem_zalloc(sz, fl) spl_vmem_zalloc((sz), (fl), __func__, __LINE__)
 #define vmem_free(ptr, sz) spl_vmem_free((ptr), (sz))
+#define vmem_qcache_reap(ptr) ((void)0)
 
 extern void *spl_vmem_alloc(size_t sz, int fl, const char *func, int line);
 extern void *spl_vmem_zalloc(size_t sz, int fl, const char *func, int line);

include/sys/vmsystm.h

@@ -36,6 +36,9 @@
 #define membar_producer() smp_wmb()
 #define physmem totalram_pages
 #define freemem nr_free_pages()
+#define needfree 0
+#define desfree 0
+#define lotsfree 0
 
 #define xcopyin(from, to, size) copy_from_user(to, from, size)
 #define xcopyout(from, to, size) copy_to_user(to, from, size)