Fix undefined reference on spl_mutex_spin_max().

Commit 3160d4f56bf35492e9c400094f8c1ff2066d4459 changed the set of
conditions under which spl_mutex_spin_max would be implemented as a
function by changing an #if in sys/mutex.h. The corresponding
implementation file spl-mutex.c, however, has not been updated to
reflect the change. This results in undefined reference errors on
spl_mutex_spin_max under the following condition:

((!CONFIG_SMP || CONFIG_DEBUG_MUTEXES) && HAVE_MUTEX_OWNER && HAVE_TASK_CURR)

This patch fixes the issue by using the same #if in sys/mutex.h and
spl-mutex.c.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue zfsonlinux/zfs#851

diff --git a/module/spl/spl-mutex.c b/module/spl/spl-mutex.c
index 983245dc0b16745db130db3d91d8c59f293b010b..d452681b13193411df9de5b0330183913e0f5e5f 100644 (file)
--- a/module/spl/spl-mutex.c
+++ b/module/spl/spl-mutex.c
@@ -51,7 +51,7 @@
  * unavailable we provide a standard mutex.
  */
 
-#ifndef HAVE_MUTEX_OWNER
+#if !defined(HAVE_MUTEX_OWNER) || !defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES)
 #ifdef HAVE_TASK_CURR
 /*
  * mutex_spin_max = { 0, -1, 1-MAX_INT }