Remove zio_alloc_arena

We declare zio_alloc_arena using extern, but it does not appear to exist
anywhere in the code. This permits undefined behavior, so lets remove
it.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1614

diff --git a/module/zfs/zio.c b/module/zfs/zio.c
index 1acb801395143897903bf9044521533ca5ec66f0..62a9082cbb8829d7568490909d233220d6f90817 100644 (file)
--- a/module/zfs/zio.c
+++ b/module/zfs/zio.c
@@ -79,9 +79,6 @@ kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
 int zio_bulk_flags = 0;
 int zio_delay_max = ZIO_DELAY_MAX;
 
-#ifdef _KERNEL
-extern vmem_t *zio_alloc_arena;
-#endif
 extern int zfs_mg_alloc_failures;
 
 /*
@@ -151,9 +148,6 @@ zio_init(void)
        size_t c;
        vmem_t *data_alloc_arena = NULL;
 
-#ifdef _KERNEL
-       data_alloc_arena = zio_alloc_arena;
-#endif
        zio_cache = kmem_cache_create("zio_cache", sizeof (zio_t), 0,
            zio_cons, zio_dest, NULL, NULL, NULL, KMC_KMEM);
        zio_link_cache = kmem_cache_create("zio_link_cache",